共用题干More About Alzheimer's DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict_______(51)is at risk of getting this neurological disorder.The only current means of_____(52)the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia（痴呆）."Since Alois Alzheimer described the_____(53)nearly a century ago,people have been trying to find a way to_____(54)diagnose it in its early stages,"said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Maryland."This discovery,if_____(55),could prove a big step forward in our efforts to deal with and understand the disease."Alzheimer ' 5 is the single greatest _________ ( 56 ) of mental deterioration（退化）in older people, affecting between 2.5 million and 4 million people in the United States_____(57).The devastating disorder gradually destroys memory and the ability to function,and eventually causes death.There is currently no known______（58)for the disease.Researches______(59)that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium（钾）in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's______(60)from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects______(61)the cells in the brain,scientists said.The flow of potassium is especially______(62)in cells responsible for memory formation.The scientists also found two other defects that affect the cells'supply, of calcium（钙）,another critical element.One test developed by researches calls______(63)growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that_______(64)the flow of potassium are open.Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostic test can be proven it would be an important______(65),but cautioned that other promising tests for Alzheimer's have been disappointing._________64A:start B:getC:follow D:govern
共用题干
More About Alzheimer's Disease
Scientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict_______(51)is at risk of getting this neurological disorder.
The only current means of_____(52)the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia（痴呆）.
"Since Alois Alzheimer described the_____(53)nearly a century ago,people have been trying to find a way to_____(54)diagnose it in its early stages,"said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Maryland."This discovery,if_____(55),could prove a big step forward in our efforts to deal with and understand the disease."
Alzheimer ' 5 is the single greatest _________ ( 56 ) of mental deterioration（退化）in older people, affecting between 2.5 million and 4 million people in the United States_____(57).The devastating disorder gradually destroys memory and the ability to function,and eventually causes death.There is currently no known______（58)for the disease.
Researches______(59)that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium（钾）in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's______(60)from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects______(61)the cells in the brain,scientists said.
The flow of potassium is especially______(62)in cells responsible for memory formation.The scientists also found two other defects that affect the cells'supply, of calcium（钙）,another critical element.
One test developed by researches calls______(63)growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that_______(64)the flow of potassium are open.Open potassium channels create a unique electrical signature.
A spokesman for the Alzheimer's Association said that if the validity of the diagnostic test can be proven it would be an important______(65),but cautioned that other promising tests for Alzheimer's have been disappointing.
More About Alzheimer's Disease
Scientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict_______(51)is at risk of getting this neurological disorder.
The only current means of_____(52)the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia（痴呆）.
"Since Alois Alzheimer described the_____(53)nearly a century ago,people have been trying to find a way to_____(54)diagnose it in its early stages,"said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Maryland."This discovery,if_____(55),could prove a big step forward in our efforts to deal with and understand the disease."
Alzheimer ' 5 is the single greatest _________ ( 56 ) of mental deterioration（退化）in older people, affecting between 2.5 million and 4 million people in the United States_____(57).The devastating disorder gradually destroys memory and the ability to function,and eventually causes death.There is currently no known______（58)for the disease.
Researches______(59)that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium（钾）in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's______(60)from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects______(61)the cells in the brain,scientists said.
The flow of potassium is especially______(62)in cells responsible for memory formation.The scientists also found two other defects that affect the cells'supply, of calcium（钙）,another critical element.
One test developed by researches calls______(63)growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that_______(64)the flow of potassium are open.Open potassium channels create a unique electrical signature.
A spokesman for the Alzheimer's Association said that if the validity of the diagnostic test can be proven it would be an important______(65),but cautioned that other promising tests for Alzheimer's have been disappointing.
_________64
A:start
B:get
C:follow
D:govern
A:start
B:get
C:follow
D:govern
参考解析
解析：此空处的词作宾语从句的主语，又根据句意可知，此处的主语应表示人，故选D。
文章中第一段中的皮肤反应测验的目的是为了诊断老年痴呆症。此处承接上文内容，故选D。
由后半句中的diagnose it可知，此处应填disease。
此空处的副词用来修饰之后的diagnose这个动词，比较四个选项，只有B项accurately （准确地）符合文意。
此处if引导的成分在句中作插入语，表达的意思为“如果确认的话”，故选C。
此处表达的意思为老年痴呆症是导致老年人脑力下降的唯一最大的原因。故此空处应填cause。
此处所表达的意思是：仅在美国，每年就有250万到400万美国人遭受老年痴呆症的困扰，alone表示“仅仅”，故选D。
本句话的意思为：目前还没有针对这种疾病的确切疗法。故此处用treatment。
本句中that之后陈述的是研究人员发现的一个事实，并没有表示预测、期望或警告。因此本题选A。
由文中可知，老年痴呆症是身体的生理病变引起的结果，result from意为“因……而产生”。
此处的含义为这种缺陷会对大脑中的细胞产生影响，故选A。
由本段第二句中的another critical element可知，此处应选critical。
call for为固定搭配，意为“要求，需要”。
此处表述的内容为控制钾的流动的管道。故此空应填govern。
根据句意可知，此项诊断性测试如果能得到验证，那将会是一个很重大的进步，故选C。
文章中第一段中的皮肤反应测验的目的是为了诊断老年痴呆症。此处承接上文内容，故选D。
由后半句中的diagnose it可知，此处应填disease。
此空处的副词用来修饰之后的diagnose这个动词，比较四个选项，只有B项accurately （准确地）符合文意。
此处if引导的成分在句中作插入语，表达的意思为“如果确认的话”，故选C。
此处表达的意思为老年痴呆症是导致老年人脑力下降的唯一最大的原因。故此空处应填cause。
此处所表达的意思是：仅在美国，每年就有250万到400万美国人遭受老年痴呆症的困扰，alone表示“仅仅”，故选D。
本句话的意思为：目前还没有针对这种疾病的确切疗法。故此处用treatment。
本句中that之后陈述的是研究人员发现的一个事实，并没有表示预测、期望或警告。因此本题选A。
由文中可知，老年痴呆症是身体的生理病变引起的结果，result from意为“因……而产生”。
此处的含义为这种缺陷会对大脑中的细胞产生影响，故选A。
由本段第二句中的another critical element可知，此处应选critical。
call for为固定搭配，意为“要求，需要”。
此处表述的内容为控制钾的流动的管道。故此空应填govern。
根据句意可知，此项诊断性测试如果能得到验证，那将会是一个很重大的进步，故选C。
相关考题：
Frontotemporal dementia is a disease[ A] identified with loss of memory.[ B] causing damage to certain parts of the brain.[ C] whose patients may develop new talents.[ D] whose symptoms are similar to those of Alzheimer's patients.
共用题干Most Adults in U.S.Have Low Risk of Heart DiseaseMore than 80 percent of U .S.adults have a less than 10-percent risk of developing heart dis- ease in the next 10 years,according to a report in the Journal of the American College of Cardiolo-gy（心脏病学）.Just 3 percent have a risk that exceeds 20 percent.“I hope that these numbers will give physicians,researchers,health policy analysts,and others a better idea of how coronary（心脏冠状动脉的）heart disease is distributed in the U. S. population ,” lead（带头的）author Dr. Earl S. Ford , from the Centers for Disease Control and Prevention in Atlanta,said in a statement.The findings are based on analysis of data from 13,769 subjects,between 20 and 79 years of age , who participated in the Third National Health and Nutrition（营养的供给）Examination Sur- vey from 1988 to 1994.Overall,82 percent of adults had a risk of less than 10 percent,15 percent had a risk that fell between 10 to 20 percent and 3 percent had a risk above 20 percent,The proportion of subjects in the highest risk group increased with advancing age,and men were more likely than women to be in this group. By contrast, race or ethnicity（种族划分）had little effect on risk distributions.Although the report suggests that most adults have a low 10-year risk of heart disease,a large proportion have a high or immediate risk,Dr. Daniel S .Berman,from Cedars-Sinai Medi- cal Center in Los Angeles,and Dr. Nathan D.Wong,from the University of California at Irvine, note in a related editorial.Aggressive treatment measures and public health strategies are needed to shift the overall population risk downward,they add.Which of the following statements is NOT right?A:The 10-year risk of heart disease is low for most U.S.adult.B: Elderly people have a higher risk of heart disease than younger people.C: Women have a higher risk of heart disease than man.D: The distribution of the risk of heart disease are hardly related to race.
共用题干Most Adults in US Have Low Risk of Heart DiseaseMore than 80 percent of US adults have a less than 10-percent risk of developing heart disease in the next 10 years,according to a report in the Journal of the American College of Cardiology.Just 3 percent have a risk that exceeds 20 percent."I hope that these numbers will give physicians,researchers,health policy analysts,and others a better idea of how coronary heart disease is distributed in the US population,"lead author Dr.Earl S.Ford,from the Centers for Disease Control and Prevention in Atlanta,said in a statement.The findings are based on analysis of data from 13,769 subjects,between 20 and 79 years of age,who narticipated in the Third National Health and Nutrition Examination Survey from 1988 to 1994.Overall,82 percent of adults had a risk of less than 10 percent,15 percent had a risk that fell between 10 to 20 percent,and 3 percent had a risk above 20 percent.The proportion of subjects in the highest risk group increased with advancing age,and men were more likely than women to be in this group.By contrast,race or ethnicity had little effect on risk distributions.Although the report suggests that most adults have a low 10-year risk of heart disease,a large proportion have ahigh or immediate risk,Dr.Daniel S.Berman,from Cedars-Sinai Medical Center in Los Angeles,and Dr.Nathan D.Wong,from the University of California at Irvine,note in a related editorial.Aggressive treatment measures and public health strategies are needed to shift the overall population risk downward,they add. According to the passage,which of the following may contribute to the risk of getting heart disease?A:Age. B:Ethnicity.C:Race. D:Citizenship.
共用题干第三篇Cheating is when a person misleads,deceives,or acts dishonestly on purpose.For kids,cheating may happen at school,at home,or while playing a sport.A new study finds that most high school students say they have cheated on tests and homework.This study showed that 89 percent said glancing at someone else's answers during a test was cheating,but 87 percent said they'd done that at least once.Also,94 percent said providing answers to someone during a test was cheating,but 74 percent admitted to doing it.Cheating can happen in a lot of different ways.You can do it by sneaking answers to a test,but it's also cheating to break the rules of a game or contest or to pretend something is yours when it isn't. When people cheat,it's not fair to other people,like the kids who studied for the test or who were the true winners of a game or contest. If students today want to cheat,they have a more insidious tool at their disposal:cellphones.More than one third of teens with cellphones admit to having stored information on them to look at during a test or texting friends about answers.Some kids cheat because they're busy or lazy and they want to get good grades without spending the time studying. Other kids might feel like they can't pass the test without cheating. Even when there seems to be a "good reason"for cheating,cheating isn't a good idea. Kids who cheat may feel worried about getting caught.Whether they are caught or not,these kids may feel guilty,or embarrassed,or ashamed,or all three.Teachers can ban cell phones in exams and principals can suspend or expel students who cheat,but it's important to know if students continue to cheat they will have a lot of problems in the future.What do the statistics in the second paragraph indicate?A:Most students are honest.B:Cheating in school is a serious problem.C:In a test,providing answers to others is more serious than glancing at people's answers.D:Tests are difficult.
共用题干第三篇Cheating is when a person misleads,deceives,or acts dishonestly on purpose.For kids,cheating may happen at school,at home,or while playing a sport.A new study finds that most high school students say they have cheated on tests and homework.This study showed that 89 percent said glancing at someone else's answers during a test was cheating,but 87 percent said they'd done that at least once.Also,94 percent said providing answers to someone during a test was cheating,but 74 percent admitted to doing it.Cheating can happen in a lot of different ways.You can do it by sneaking answers to a test,but it's also cheating to break the rules of a game or contest or to pretend something is yours when it isn't. When people cheat,it's not fair to other people,like the kids who studied for the test or who were the true winners of a game or contest. If students today want to cheat,they have a more insidious tool at their disposal:cellphones.More than one third of teens with cellphones admit to having stored information on them to look at during a test or texting friends about answers.Some kids cheat because they're busy or lazy and they want to get good grades without spending the time studying. Other kids might feel like they can't pass the test without cheating. Even when there seems to be a "good reason"for cheating,cheating isn't a good idea. Kids who cheat may feel worried about getting caught.Whether they are caught or not,these kids may feel guilty,or embarrassed,or ashamed,or all three.Teachers can ban cell phones in exams and principals can suspend or expel students who cheat,but it's important to know if students continue to cheat they will have a lot of problems in the future.Which of the following statements is true?A:Schools can do nothing about students cheating in exams.B:Students shouldn't be allowed to use cellphones.C:Students who cheat in tests may have negative emotions.D:If there is a good reason,people can cheat.
共用题干What Is Anthrax（炭疽）?There's been a lot of talk about anthrax on the news lately.Some people are worried that anthrax may be connected to terrorist attacks or that terrorists may spread the germ that _______(1)the disease.Federal officials and police are investigating this and taking________(2)to protect us.In the meantime,it's important not to panic over anthrax.The chances that you and your family________(3)at risk are very tiny.One of the ways you can feel better is to learn about anthrax.When you know what it is and________(4)you can get it,it doesn't seem quite as scary.So,what _______(5)is anthrax?Here are the facts on anthrax:Anthrax is a bacterial infection caused by a germ.Although it's most common in farm _______(6),like sheep,cows,pigs,horses,and goats,there's a very small chance that people can get it,too.Anthrax spores（抱子）(a version of the germ in a protective shell that can live in the soil for years)cause the disease.People may get anthrax if they are exposed to anthrax_______(7).But here's the important part:just being exposed to these spores doesn't mean that a person will get ________(8).For a person to get sick,he would have to breathe in thousands of these spores all the way into his________(9).Or he'd have to eat meat contaminated with anthrax orhandle_______(10)that has anthrax spores.This may sound scary,but even whena person comes______(11)contact with the spores,it's unlikely that he'll get sick._________(12)the bacteria do not get into the skin,digestive tract,or lung,thedisease won't develop.Anthrax is not spread from person to person the way the flu can spread from familymember to_________(13)member or classmate to classmate.Anthrax can almost always be successfully treated with antibiotics（抗生素）.Anthrax is very rare.Until recently,anthrax wasn't even talked about because it was so rare一and it still________(14)!Even with all of the anthrax cases you are hearing about right now,a person's chances of getting anthrax are about the______(15)as they were before you heard about anthrax on the news一very,very low._________(15) A:case B: same C:rate D: score
共用题干More About Alzheimer's DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict_______(51)is at risk of getting this neurological disorder.The only current means of_____(52)the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia（痴呆）."Since Alois Alzheimer described the_____(53)nearly a century ago,people have been trying to find a way to_____(54)diagnose it in its early stages,"said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Maryland."This discovery,if_____(55),could prove a big step forward in our efforts to deal with and understand the disease."Alzheimer ' 5 is the single greatest _________ ( 56 ) of mental deterioration（退化）in older people, affecting between 2.5 million and 4 million people in the United States_____(57).The devastating disorder gradually destroys memory and the ability to function,and eventually causes death.There is currently no known______（58)for the disease.Researches______(59)that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium（钾）in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's______(60)from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects______(61)the cells in the brain,scientists said.The flow of potassium is especially______(62)in cells responsible for memory formation.The scientists also found two other defects that affect the cells'supply, of calcium（钙）,another critical element.One test developed by researches calls______(63)growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that_______(64)the flow of potassium are open.Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostic test can be proven it would be an important______(65),but cautioned that other promising tests for Alzheimer's have been disappointing._________51A:what B:oneC:itD:who
共用题干Life Expectancy in the Last Hundred YearsA hundred years ago,life expectancy in developed countries was about 47;in the early 21 st century,men in the United States and the United Kingdom can expect to live to about 74,women to about 80, and these______(51)are rising all the time .What has brought______(52) these changes?When we look at the life______(53)of people 100 years ago,we need to look at the greatest______(54)of the time .In the early 20th century,these were the acute and of-ten______(55)infectious diseases such as smallpox.Many children died very young from these diseases and others,and the weak and elderly were always at risk.In the______(56)world these diseases are far______(57)today,and in some cases have almost disappcarcd.A number of______(58)have led to this:improvements in sanita- tion and hygiene,the discovery and use of antibiotics,which______(59)bacterial diseases much less dangerous,and vaccinations______(60)common diseases.______(61), people's general health has improved with improvements in our general environment:cleaner air,better means of preserving food,better and warmer housing,and better understanding of nutrition.Genetically,we should all be able to live to about 85 but______(62)people do live longer today,there are still some big killers around that are preventing us from consistently reaching that age .The problems that affect people today are the more chronic illnesses,such as heart disease and strokes,and those______(63)by viruses,such as influenza and AIDS.Of course,cancer is a huge killer as well.In most cases these diseases affect______(64)people,but there are worrying trends in the developed world with problems such as obesity______(65)more heart disease and illnesses such as diabetes at younger ages.The killers today can be classed as"lifestyle diseases",which means that it may be possiblem to halt their progress.51._________A: countriesB: livesC: yearsD: ages
共用题干第一篇More About Alzheimer' s DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict who is at risk of getting this neurological （神经病学的）disorder.The only current means of diagnosing the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia."Since Alois Alzheimer described the disease nearly a century ago,people have been trying to find a way to accurately diagnose it in its early stages,"said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Maryland."This discovery,if confirmed,could prove a big step forward in our efforts to deal with and understand the disease."Alzheimer's is the single greatest cause of mental deterioration in older people,affecting between 2.5 million and 4 million people in the United States alone.The devastating disorder gradually destroys memory and the ability to function,and eventually causes death. There is currently no known treatment for the disease.Researchers discovered that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's results from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects affect the cells in the brain,scientists said.The flow of potassium is especially critical in cells responsible for memory formation.The scientists also found two other defects that affect the cells' supply of calcium,another critical element.One test developed by researches calls for growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that govern the flow of potassium are open.Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostic test can be proven it would be an important development,but he cautioned that other promising tests for Alzheimer's have been disappointing.The last paragraph implies that the diagnostic test________.A:will not be as promising as othersB:is a very important developmentC:may not be proven valid smoothlyD:will surely be disappointing in the end
共用题干More About Alzheimer's DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict_______(51)is at risk of getting this neurological disorder.The only current means of_____(52)the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia（痴呆）."Since Alois Alzheimer described the_____(53)nearly a century ago,people have been trying to find a way to_____(54)diagnose it in its early stages,"said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Maryland."This discovery,if_____(55),could prove a big step forward in our efforts to deal with and understand the disease."Alzheimer ' 5 is the single greatest _________ ( 56 ) of mental deterioration（退化）in older people, affecting between 2.5 million and 4 million people in the United States_____(57).The devastating disorder gradually destroys memory and the ability to function,and eventually causes death.There is currently no known______（58)for the disease.Researches______(59)that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium（钾）in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's______(60)from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects______(61)the cells in the brain,scientists said.The flow of potassium is especially______(62)in cells responsible for memory formation.The scientists also found two other defects that affect the cells'supply, of calcium（钙）,another critical element.One test developed by researches calls______(63)growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that_______(64)the flow of potassium are open.Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostic test can be proven it would be an important______(65),but cautioned that other promising tests for Alzheimer's have been disappointing._________60A:keeps B:breaks C:results D:translates
共用题干第一篇More About Alzheimer' s DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict who is at risk of getting this neurological （神经病学的）disorder.The only current means of diagnosing the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia."Since Alois Alzheimer described the disease nearly a century ago,people have been trying to find a way to accurately diagnose it in its early stages,"said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Maryland."This discovery,if confirmed,could prove a big step forward in our efforts to deal with and understand the disease."Alzheimer's is the single greatest cause of mental deterioration in older people,affecting between 2.5 million and 4 million people in the United States alone.The devastating disorder gradually destroys memory and the ability to function,and eventually causes death. There is currently no known treatment for the disease.Researchers discovered that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's results from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects affect the cells in the brain,scientists said.The flow of potassium is especially critical in cells responsible for memory formation.The scientists also found two other defects that affect the cells' supply of calcium,another critical element.One test developed by researches calls for growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that govern the flow of potassium are open.Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostic test can be proven it would be an important development,but he cautioned that other promising tests for Alzheimer's have been disappointing.Which of the following statements about the Alzheimer's disease is NOT true?A:It was so named because Alois Alzheimer first described it.B:It is the greatest cause of mental deterioration in older people.C:It can gradually destroy memory and eventually cause death.D:There are many ways to deal with and cure the disease now.
共用题干More about Alzheimer's DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict who is at risk of get-ting this neurological disorder.The only current means of diagnosing the disease in a living patient is a long and expen-sive series of tests that eliminate every other cause of dementia.“Since Aloes Alzheimer described the disease nearly a century ago,people have been trying to find a way to accurately diagnose it in its early stages,“said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Mary-land."This discovery,if confirmed,could prove a big step forward in our efforts to deal with and understand the disease.”Alzheimer's is the single greatest cause of mental deterioration in older people,affecting between 2.5 million and 4 million people in the United States alone. The devastating disorder gradually destroys memory and the ability to function,and eventually causes death. There is currently no known treatment for the disease.Researches discovered that the skin cells of Alzheimer's patients have defects that inter-fere with their ability to regulate the flow of potassium in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's results from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects affect the cells in the brain,scientists said.The flow of potassium is especially critical in cells responsible for memory formation. The scientists also found two other defects that affect the cells'supply of calcium,another critical element.One test developed by researches calls for growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that govemn the flow of potassium are open. Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostictest can be proven it would be an important development,but cautioned that other promisingtests for Alzheimer's have been disappointing.The passage indicates that Alzheimer's is a disease______.A: common to people,old and youngB: not costly to be curedC: easy to be handledD: not easy to be diagnosed
共用题干More about Alzheimer's DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict who is at risk of get-ting this neurological disorder.The only current means of diagnosing the disease in a living patient is a long and expen-sive series of tests that eliminate every other cause of dementia.“Since Aloes Alzheimer described the disease nearly a century ago,people have been trying to find a way to accurately diagnose it in its early stages,“said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Mary-land."This discovery,if confirmed,could prove a big step forward in our efforts to deal with and understand the disease.”Alzheimer's is the single greatest cause of mental deterioration in older people,affecting between 2.5 million and 4 million people in the United States alone. The devastating disorder gradually destroys memory and the ability to function,and eventually causes death. There is currently no known treatment for the disease.Researches discovered that the skin cells of Alzheimer's patients have defects that inter-fere with their ability to regulate the flow of potassium in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's results from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects affect the cells in the brain,scientists said.The flow of potassium is especially critical in cells responsible for memory formation. The scientists also found two other defects that affect the cells'supply of calcium,another critical element.One test developed by researches calls for growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that govemn the flow of potassium are open. Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostictest can be proven it would be an important development,but cautioned that other promisingtests for Alzheimer's have been disappointing.Which of the following statements about the Alzheimer's disease is NOT true?A: It was so named because Aloes Alzheimer first described it.B: It is the greatest cause of mental deterioration in older people.C: It can destroy memory gradually and eventually cause death.D: There are many ways to deal with and cure the disease now.
共用题干More about Alzheimer's DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict who is at risk of get-ting this neurological disorder.The only current means of diagnosing the disease in a living patient is a long and expen-sive series of tests that eliminate every other cause of dementia.“Since Aloes Alzheimer described the disease nearly a century ago,people have been trying to find a way to accurately diagnose it in its early stages,“said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Mary-land."This discovery,if confirmed,could prove a big step forward in our efforts to deal with and understand the disease.”Alzheimer's is the single greatest cause of mental deterioration in older people,affecting between 2.5 million and 4 million people in the United States alone. The devastating disorder gradually destroys memory and the ability to function,and eventually causes death. There is currently no known treatment for the disease.Researches discovered that the skin cells of Alzheimer's patients have defects that inter-fere with their ability to regulate the flow of potassium in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's results from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects affect the cells in the brain,scientists said.The flow of potassium is especially critical in cells responsible for memory formation. The scientists also found two other defects that affect the cells'supply of calcium,another critical element.One test developed by researches calls for growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that govemn the flow of potassium are open. Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostictest can be proven it would be an important development,but cautioned that other promisingtests for Alzheimer's have been disappointing.The newly developed skin tests may be used in the future to allow doctorsto______.A:.cure those with Alzheimer's diseaseB: discover the cause of Alzheimer's diseaseC: predict who might get Alzheimer's diseaseD: find the consequence of Alzheimer's disease
共用题干More about Alzheimer's DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict who is at risk of get-ting this neurological disorder.The only current means of diagnosing the disease in a living patient is a long and expen-sive series of tests that eliminate every other cause of dementia.“Since Aloes Alzheimer described the disease nearly a century ago,people have been trying to find a way to accurately diagnose it in its early stages,“said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Mary-land."This discovery,if confirmed,could prove a big step forward in our efforts to deal with and understand the disease.”Alzheimer's is the single greatest cause of mental deterioration in older people,affecting between 2.5 million and 4 million people in the United States alone. The devastating disorder gradually destroys memory and the ability to function,and eventually causes death. There is currently no known treatment for the disease.Researches discovered that the skin cells of Alzheimer's patients have defects that inter-fere with their ability to regulate the flow of potassium in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's results from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects affect the cells in the brain,scientists said.The flow of potassium is especially critical in cells responsible for memory formation. The scientists also found two other defects that affect the cells'supply of calcium,another critical element.One test developed by researches calls for growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that govemn the flow of potassium are open. Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostictest can be proven it would be an important development,but cautioned that other promisingtests for Alzheimer's have been disappointing.Which of the following about the relationship between Alzheimer's and dementia is true?A: Dementia is one of the signs of Alzheimer's.B: Alzheimer's is one of the causes of dementia.C: They are two completely different diseases.D: They are similar defects of the human brain.
共用题干第一篇ObesityObesity refers to the medical condition characterized by storage of excess body fat. The human body naturally stores fat tissue under the skin and around organs and joints.Fat is critical for good health because it is a source of energy when the body lacks the energy necessary to sustain life processes,and it provides insulation and protection for internal organs.But too much fat in the body is associated with a variety of health problems.Most physicians use the body mass index(BMI)to determine desirable weights.BMI is calculated as weight divided by height and people with a BMI of 27 or above are considered obese.Weight-height tables,such as those published by the Metropolitan Life Insurance Company,are also used as general measures of desirable weight ranges.These tables assign a range of weights for a particular height.For example,a man of 1.8m has a desirable range of 66 to 83 kg,with an average of 75 kg. A woman who is 1.6 m has a desirable range between 53 and 70 kg,with an average of 62 kg.The BMI and weight-height tables only provide rough estimates of desirable weights and scientists recognize that many other factors besides height affect weight. Weight alone may not be an indicator of fat,as in the case of a body-builder who may have a high BMI because of a high percentage of muscle tissue,which weighs more than fat. Likewise,a person with a sedentary lifestyle may be within a desirable weight range but have excess fat tissue.Obesity increases the risk of developing disease.According to some estimates,almost 70 percent of heart disease cases are linked to excess body fat,and obese people are more than twice as likely to develop high blood pressure.Obese women are at nearly twice the risk for developing breast cancer,and all obese people have an estimated 42 percent higher chance of developing colon cancer. The risk of medical complications particularly heart disease increases when body fat is distributed around the waist,especially in the abdomen.This type of upper body fat distribution is more common in men than in women.The social and psychological problems experienced by obese people are also formidable.Stereotypes about"fat"people are often translated into discriminatory practices in education,employment, and social relationships.The consequences of being obese in a world where people had better be "thin"are especially severe for women,whose appearances are often judged against and ideal of exaggerated slimness.According to this article,fat people may be_________.A:looked down upon by othersB:welcomed by othersC:considered severely illD:thought of having special problems
共用题干第一篇ObesityObesity refers to the medical condition characterized by storage of excess body fat. The human body naturally stores fat tissue under the skin and around organs and joints.Fat is critical for good health because it is a source of energy when the body lacks the energy necessary to sustain life processes,and it provides insulation and protection for internal organs.But too much fat in the body is associated with a variety of health problems.Most physicians use the body mass index(BMI)to determine desirable weights.BMI is calculated as weight divided by height and people with a BMI of 27 or above are considered obese.Weight-height tables,such as those published by the Metropolitan Life Insurance Company,are also used as general measures of desirable weight ranges.These tables assign a range of weights for a particular height.For example,a man of 1.8m has a desirable range of 66 to 83 kg,with an average of 75 kg. A woman who is 1.6 m has a desirable range between 53 and 70 kg,with an average of 62 kg.The BMI and weight-height tables only provide rough estimates of desirable weights and scientists recognize that many other factors besides height affect weight. Weight alone may not be an indicator of fat,as in the case of a body-builder who may have a high BMI because of a high percentage of muscle tissue,which weighs more than fat. Likewise,a person with a sedentary lifestyle may be within a desirable weight range but have excess fat tissue.Obesity increases the risk of developing disease.According to some estimates,almost 70 percent of heart disease cases are linked to excess body fat,and obese people are more than twice as likely to develop high blood pressure.Obese women are at nearly twice the risk for developing breast cancer,and all obese people have an estimated 42 percent higher chance of developing colon cancer. The risk of medical complications particularly heart disease increases when body fat is distributed around the waist,especially in the abdomen.This type of upper body fat distribution is more common in men than in women.The social and psychological problems experienced by obese people are also formidable.Stereotypes about"fat"people are often translated into discriminatory practices in education,employment, and social relationships.The consequences of being obese in a world where people had better be "thin"are especially severe for women,whose appearances are often judged against and ideal of exaggerated slimness.A heavy man ________.A:certainly has a lot of fat in himB:usually has a sedentary lifestyleC:certainly has a lot muscle in himD:may have muscle tissue that weighs more than fat
共用题干What Is Anthrax（炭疽）?There's been a lot of talk about anthrax on the news lately.Some people are worried that anthrax may be connected to terrorist attacks or that terrorists may spread the germ that _______(1)the disease.Federal officials and police are investigating this and taking________(2)to protect us.In the meantime,it's important not to panic over anthrax.The chances that you and your family________(3)at risk are very tiny.One of the ways you can feel better is to learn about anthrax.When you know what it is and________(4)you can get it,it doesn't seem quite as scary.So,what _______(5)is anthrax?Here are the facts on anthrax:Anthrax is a bacterial infection caused by a germ.Although it's most common in farm _______(6),like sheep,cows,pigs,horses,and goats,there's a very small chance that people can get it,too.Anthrax spores（抱子）(a version of the germ in a protective shell that can live in the soil for years)cause the disease.People may get anthrax if they are exposed to anthrax_______(7).But here's the important part:just being exposed to these spores doesn't mean that a person will get ________(8).For a person to get sick,he would have to breathe in thousands of these spores all the way into his________(9).Or he'd have to eat meat contaminated with anthrax orhandle_______(10)that has anthrax spores.This may sound scary,but even whena person comes______(11)contact with the spores,it's unlikely that he'll get sick._________(12)the bacteria do not get into the skin,digestive tract,or lung,thedisease won't develop.Anthrax is not spread from person to person the way the flu can spread from familymember to_________(13)member or classmate to classmate.Anthrax can almost always be successfully treated with antibiotics（抗生素）.Anthrax is very rare.Until recently,anthrax wasn't even talked about because it was so rare一and it still________(14)!Even with all of the anthrax cases you are hearing about right now,a person's chances of getting anthrax are about the______(15)as they were before you heard about anthrax on the news一very,very low._________(9) A:stomach B: lung C: mouth D: skin
共用题干第一篇More About Alzheimer' s DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict who is at risk of getting this neurological （神经病学的）disorder.The only current means of diagnosing the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia."Since Alois Alzheimer described the disease nearly a century ago,people have been trying to find a way to accurately diagnose it in its early stages,"said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Maryland."This discovery,if confirmed,could prove a big step forward in our efforts to deal with and understand the disease."Alzheimer's is the single greatest cause of mental deterioration in older people,affecting between 2.5 million and 4 million people in the United States alone.The devastating disorder gradually destroys memory and the ability to function,and eventually causes death. There is currently no known treatment for the disease.Researchers discovered that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's results from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects affect the cells in the brain,scientists said.The flow of potassium is especially critical in cells responsible for memory formation.The scientists also found two other defects that affect the cells' supply of calcium,another critical element.One test developed by researches calls for growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that govern the flow of potassium are open.Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostic test can be proven it would be an important development,but he cautioned that other promising tests for Alzheimer's have been disappointing.What is the relationship between Alzheimer's and dementia?A:Dementia is one of the signs of Alzheimer's.B:Alzheimer's is one of the causes of dementia.C:They are two completely different diseases.D:They are similar defects of the human brain.
共用题干第一篇More About Alzheimer' s DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict who is at risk of getting this neurological （神经病学的）disorder.The only current means of diagnosing the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia."Since Alois Alzheimer described the disease nearly a century ago,people have been trying to find a way to accurately diagnose it in its early stages,"said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Maryland."This discovery,if confirmed,could prove a big step forward in our efforts to deal with and understand the disease."Alzheimer's is the single greatest cause of mental deterioration in older people,affecting between 2.5 million and 4 million people in the United States alone.The devastating disorder gradually destroys memory and the ability to function,and eventually causes death. There is currently no known treatment for the disease.Researchers discovered that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's results from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects affect the cells in the brain,scientists said.The flow of potassium is especially critical in cells responsible for memory formation.The scientists also found two other defects that affect the cells' supply of calcium,another critical element.One test developed by researches calls for growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that govern the flow of potassium are open.Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostic test can be proven it would be an important development,but he cautioned that other promising tests for Alzheimer's have been disappointing.The passage indicates that Alzheimer's is a disease________.A:common to people,old and youngB:not costly to be curedC:easy to be handledD:not easy to be diagnosed
共用题干More about Alzheimer's DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict who is at risk of get-ting this neurological disorder.The only current means of diagnosing the disease in a living patient is a long and expen-sive series of tests that eliminate every other cause of dementia.“Since Aloes Alzheimer described the disease nearly a century ago,people have been trying to find a way to accurately diagnose it in its early stages,“said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Mary-land."This discovery,if confirmed,could prove a big step forward in our efforts to deal with and understand the disease.”Alzheimer's is the single greatest cause of mental deterioration in older people,affecting between 2.5 million and 4 million people in the United States alone. The devastating disorder gradually destroys memory and the ability to function,and eventually causes death. There is currently no known treatment for the disease.Researches discovered that the skin cells of Alzheimer's patients have defects that inter-fere with their ability to regulate the flow of potassium in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's results from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects affect the cells in the brain,scientists said.The flow of potassium is especially critical in cells responsible for memory formation. The scientists also found two other defects that affect the cells'supply of calcium,another critical element.One test developed by researches calls for growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that govemn the flow of potassium are open. Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostictest can be proven it would be an important development,but cautioned that other promisingtests for Alzheimer's have been disappointing.The last paragraph implies that the diagnostic test______.A: will not be as promising as othersB: is a very important developmentC: may not be proven valid smoothlyD: will surely be disappointing in the end
共用题干More About Alzheimer's DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict_______(51)is at risk of getting this neurological disorder.The only current means of_____(52)the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia（痴呆）."Since Alois Alzheimer described the_____(53)nearly a century ago,people have been trying to find a way to_____(54)diagnose it in its early stages,"said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Maryland."This discovery,if_____(55),could prove a big step forward in our efforts to deal with and understand the disease."Alzheimer ' 5 is the single greatest _________ ( 56 ) of mental deterioration（退化）in older people, affecting between 2.5 million and 4 million people in the United States_____(57).The devastating disorder gradually destroys memory and the ability to function,and eventually causes death.There is currently no known______（58)for the disease.Researches______(59)that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium（钾）in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's______(60)from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects______(61)the cells in the brain,scientists said.The flow of potassium is especially______(62)in cells responsible for memory formation.The scientists also found two other defects that affect the cells'supply, of calcium（钙）,another critical element.One test developed by researches calls______(63)growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that_______(64)the flow of potassium are open.Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostic test can be proven it would be an important______(65),but cautioned that other promising tests for Alzheimer's have been disappointing._________53A:answer B:effect C:disease D:study
共用题干第一篇More About Alzheimer' s DiseaseScientists have developed skin tests that may be used in the future to identify people with Alzheimer's disease and may ultimately allow physicians to predict who is at risk of getting this neurological （神经病学的）disorder.The only current means of diagnosing the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia."Since Alois Alzheimer described the disease nearly a century ago,people have been trying to find a way to accurately diagnose it in its early stages,"said Patricia Grady,acting director of the National Institute of Neurological Disorders and Stroke in Bethesda,Maryland."This discovery,if confirmed,could prove a big step forward in our efforts to deal with and understand the disease."Alzheimer's is the single greatest cause of mental deterioration in older people,affecting between 2.5 million and 4 million people in the United States alone.The devastating disorder gradually destroys memory and the ability to function,and eventually causes death. There is currently no known treatment for the disease.Researchers discovered that the skin cells of Alzheimer's patients have defects that interfere with their ability to regulate the flow of potassium in and out of the cells.The fact that the cell defects are present in the skin suggests that Alzheimer's results from physiological changes throughout the body,and that dementia may be the first noticeable effect of these changes as the defects affect the cells in the brain,scientists said.The flow of potassium is especially critical in cells responsible for memory formation.The scientists also found two other defects that affect the cells' supply of calcium,another critical element.One test developed by researches calls for growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that govern the flow of potassium are open.Open potassium channels create a unique electrical signature.A spokesman for the Alzheimer's Association said that if the validity of the diagnostic test can be proven it would be an important development,but he cautioned that other promising tests for Alzheimer's have been disappointing.The newly developed skin tests may be used in the future to allow doctors to________.A:cure those with Alzheimer's diseaseB:discover the cause of Alzheimer's diseaseC:predict who might get Alzheimer's diseaseD:find the consequences of Alzheimer's disease
共用题干Natural MedicinesSince earliest days,humans have used some kinds of medicines.We know this because humans have survived.Ancient treatments for injury and disease were successful enough to keep humans from dying out completely.They were successful long before the time of modern medicine. Before the time of doctors with white coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospitals.Yet injuries are treated.And diseases are often cured.How?By ancient methods. By medicines that might seem mysterious , even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,however.Through the centuries , tribal（部落的）medicine men experimented with plants. They found many useful chemicals in the plants.And scientists believe many of these traditional medicines may provide the cure for some of today's most serious diseases.Experts say almost 80% of the people in the world use plants for health care.These natural medicines are used not just because people have no other form of treatment. They are used because people trust them. In developed areas,few people think about the source of the medicines they buy in a store .Yet many widely-used medicines are from ancient sources,especially plants.Some experts say more than 25%of modem medicines come,in one way or another,from nature.Scientists have long known that nature is really a chemical factory. All living things contain chemicals that help them survive .So scientists' interest in traditional medicine is not new.But it has become an urgent concern.This is because the earth's supply of natural medicines may be dropping rapidly. It can be seen from the passage that the earth's supply of natural medicines______.A: may never be exhaustedB: may be dropping rapidlyC: is surprisingly bigD: is as rich as ever
共用题干AgingThroughout history man has had to accept the fact that all living things must die,but people now live longer than they used to.Yet all living things still show the________(51)of aging,which will eventually________(52)death.Aging is not a disease,but as a person passes maturity,the cells of the body and the________ (53) do not function as well as they did in childhood and adolescence（青春期）.The body provides less________(54)against disease and is more likely________(55)have accident.A number of related causes may________(56)aging. Some cells of the body have a fairly long life,but they are not reborn when they die.As a person ages,________(57)of brain cells and muscle cells decreases.The other cells are replaced by new cells.In an aging person the________(58) cells and muscle cells may not be as viable（能生存的）or as capable________ ( 59 ) growth as those of a young person.Another________(60)in aging may be changes within the cells themselves.Some of the protein chemicals in cells are known________(61)with age and became less elastic.This is why the skin of old people wrinkles and________(62).This is also the reason old people________(63)in height. There may not be other more important chemical changes in the cells.Some complex cell chemicals, such as DNA and RNA,store and________(64)information that the cells need.Aging may affect this________(65)and change the information-carry molecules so that they do not transmit the information as well._________(51)A:function B:effectC:fact D:symbol
共用题干Natural MedicinesSince earliest days,humans have used some kinds of medicines.We know this because hu- mans have survived .Ancient treatments for injury and disease were successful enough to keep hu- mans from dying out completely.They were successful long before the time of modern medicine.Before the time of doctors with white coats and shiny（发亮的）instruments. Before the time of big hospitals with strange and wonderful equipment.Many parts of the world still do not have university-educated doctors.Nor do they have ex-pensive hospitals.Yet injuries are treated.And diseases are often cured.How?By ancient meth- ods. By medicines that might seem mysterious, even magical（有魔力的）.Traditional medicines are neither mysterious nor magical,however.Through the centuries, tribal（部落的）medicine men experimented with plants. They found many useful chemicals in the plants.And scientists believe many of these traditional medicines may provide the cure for some of today's most serious diseases.Experts say almost 80% of the people in the world use plants for health care.These natural medicines are used not just because people have no other form of treatment.They are used be-cause people trust them.In developed areas,few people think about the source of the medicines they buy in a store .Yet many widely-used medicines are from ancient sources,especially plants. Some experts say more than 25%of modern medicines come,in one way or another,from nature.Scientists have long known that nature is really a chemical factory.All living things contain chemicals that help them survive.So scientists' interest in traditional medicine is not new.But it has become an urgent concern.This is because the earth's supply of natural medicines may be dropping rapidly. It can be seen from the passage that the earth's supply of natural medicines______.A: may never be exhaustedB: may be dropping rapidlyC: is surprisingly bigD: is as rich as ever
单选题Who has a lower risk of developing Alzheimer’s disease?APeople who have received little education.BPeople who have mentally active jobs.CPeople who first have good memories.
单选题What are we told about people suffering from Alzheimer’s disease?AThey don’t understand the mechanisms of memory.BThey can’t remember who they are.CThey forget how to perform simple tasks.