问答题Dental Health Decay is not the only disease that can cause tooth loss. Another serious disease affects the gums, the tissue that surrounds the teeth. It is also caused by bacteria. If the bacteria are not removed every day, they form a substance that stays on the teeth. The substance is known as plaque. At first, the gums appear to be swollen, and may bleed when the teeth are brushed. This can lead to serious infection of the tissue around the teeth. The infection may damage the bone that supports the teeth and cause tooth loss and other health problems. Studies have found that people with severe gum disease have an increased risk of developing heart disease, diabetes and stroke. Gum disease can be treated by a special dentist called a periodontist. Periodontists are trained to repair the gum areas that have been damaged. This can be painful and costly. Dental health experts say the best thing to do is to stop gum disease before it starts. The way to do this is to clean the teeth every day. People also should use dental floss to remove plaque from between the teeth. Most experts also agree that another way to prevent tooth and gum problems is to eat foods high in calcium and vitamins and low in sugar. Scientists continue to develop better dental treatments and equipment. Improved technology may change the way people receive dental treatment in the future. For example, dentists are now suing laser light to treat diseased gums and teeth. Dentists use computer technology to help them repair damaged teeth. Researchers have developed improved methods to repair bone that supports the teeth. And genetic research is expected to develop tests that will show the presence of disease causing bacteria in the mouth. Such increased knowledge about dental diseases and ways to prevent them has improved the health of many people. Yet problems remain in some areas. In industrial countries, minorities and other groups have a high level of untreated dental disease. In developing countries, many areas do not have even emergency care services. The World Health Organization says people in countries in Africa have the most tooth and gum problems. World Health Organization experts say the dental health situation is different for almost every country in the world. As a result, it has developed oral health programs separately for each area. The WHO oral health program is mainly for people living in poor areas. It provides them with information about mouth diseases and health care. It also studies preventive programs using fluoride in water, salt, mild and toothpaste. And it explores ways to include dental health in national health care systems. Many governments and other organizations provide help, so people can get needed dental health services. But dental health professionals say people should take good care of their teeth and gums. They say people should keep their teeth as clean as possible. They should eat foods high in calcium and fiber. These include milk products, whole grain breads and cereals, vegetables, fruits, beans and nuts. Recent studies have shown that eating nuts can help slow the production of plaque on the teeth. Experts say these activities will help everyone improve their dental health throughout their lives.
问答题
Dental Health Decay is not the only disease that can cause tooth loss. Another serious disease affects the gums, the tissue that surrounds the teeth. It is also caused by bacteria. If the bacteria are not removed every day, they form a substance that stays on the teeth. The substance is known as plaque. At first, the gums appear to be swollen, and may bleed when the teeth are brushed. This can lead to serious infection of the tissue around the teeth. The infection may damage the bone that supports the teeth and cause tooth loss and other health problems. Studies have found that people with severe gum disease have an increased risk of developing heart disease, diabetes and stroke. Gum disease can be treated by a special dentist called a periodontist. Periodontists are trained to repair the gum areas that have been damaged. This can be painful and costly. Dental health experts say the best thing to do is to stop gum disease before it starts. The way to do this is to clean the teeth every day. People also should use dental floss to remove plaque from between the teeth. Most experts also agree that another way to prevent tooth and gum problems is to eat foods high in calcium and vitamins and low in sugar. Scientists continue to develop better dental treatments and equipment. Improved technology may change the way people receive dental treatment in the future. For example, dentists are now suing laser light to treat diseased gums and teeth. Dentists use computer technology to help them repair damaged teeth. Researchers have developed improved methods to repair bone that supports the teeth. And genetic research is expected to develop tests that will show the presence of disease causing bacteria in the mouth. Such increased knowledge about dental diseases and ways to prevent them has improved the health of many people. Yet problems remain in some areas. In industrial countries, minorities and other groups have a high level of untreated dental disease. In developing countries, many areas do not have even emergency care services. The World Health Organization says people in countries in Africa have the most tooth and gum problems. World Health Organization experts say the dental health situation is different for almost every country in the world. As a result, it has developed oral health programs separately for each area. The WHO oral health program is mainly for people living in poor areas. It provides them with information about mouth diseases and health care. It also studies preventive programs using fluoride in water, salt, mild and toothpaste. And it explores ways to include dental health in national health care systems. Many governments and other organizations provide help, so people can get needed dental health services. But dental health professionals say people should take good care of their teeth and gums. They say people should keep their teeth as clean as possible. They should eat foods high in calcium and fiber. These include milk products, whole grain breads and cereals, vegetables, fruits, beans and nuts. Recent studies have shown that eating nuts can help slow the production of plaque on the teeth. Experts say these activities will help everyone improve their dental health throughout their lives.
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Passage TwoQuestions 26 to 30 are based on the following passage.Scientists have established that influenza viruses taken from man can cause the disease in animals. In addition，man can catch the disease from animals. In fact，a great number of wild birds seem to carry the virus without showing any evidence of illness. Some scientists conclude that a large family of influenza viruses may have evolved in the bird kingdom，a group that has been on the earth 100 million years and is able to carry the virus without contracting the disease. These are even convincing evidence to show that virus strains are transmitted from place to place and from continent to continent by migrating birds.It is known that two influenza viruses can recombine when both are present in an animal at the same time. The result of such recombinations is a great variety of strains constraining different H and N spikes. This raises the possibility that a human influenza virus can recombine with an influenza virus form. a lower animal to produce an entirely new spike.Research is underway to determine if that is the way that major new strains come into being. Another possibility is that two animal influenza strains may recombine in a pig，for example，to produce a new strain which is transmitted to man.According to the passage，scientists have discovered that influenza viruses______.A. cause ill health in wild birdsB. do not always cause symptoms in birdsC. are rarely present in wild birdsD. change when transferred from animals to man
Which of the following is TRUE according to the passage?A. This influenza can cause death if not treated immediately.B. The number of the influenza virus can grow very rapidly.C. The people who got the disease recovered soon.D. The London doctors did not take the virus seriously at first.
What can cause the disasters of gap years?［A］ Intervention of parents. ［B］ Careful planning. ［C］ Good health. ［D］ Realistic expectation.
In accordance with Maritime Health Declaration，______ is not an infectious disease．A.choleraB.typhus feverC.yellow feverD.venereal disease
共用题干第二篇As we have seen,the focus of medical care in our society has been shifting from curing disease to preventing disease一especially in terms of changing our many unhealthy behaviors,such as poor eating habits,smoking,and failure to exercise.The line of thought involved in this shift can be pursued further. Imagine a person who is about the right weight , but does not eat very nutritious（有营养的）foods , who feels OK but exercises only occasionally , who goes to work every day , but is not an outstanding worker,who drinks a few beers at home most nights but does not drive while drunk, and who has no chest pains or abnormal blood counts,but sleeps a lot and often feels tired.This person is not ill.He may not even be at risk for any particular disease.But we can imagine that this person could be a lot healthier.The field of medicine has not traditionally distinguished between someone who is merely "not ill" and someone who is in excellent health and pays attention to the body's special needs.Both types have simply been called "well".In recent years,however,some health specialists have begun to apply the terms "well" and "weilness" only to those who are actively striving to maintain and improve their body's condition.Most importantly,perhaps,people who are well take active responsibility for all matters related to their health.Even people who have a physical disease or handicap（缺陷）may be "well" ,in this new sense,if they make an effort to maintain the best possible health they can in the face of their physical limitations."Wellness" may perhaps best be viewed not as a state that people can achieve,but as an ideal that people can strive for. People who are well are likely to be better able to resist disease and to fight disease when it strikes.And by focusing attention on healthy ways of living,the concept of weilness can have a beneficial impact on the way in which people face the challenges of daily life.The first paragraph implies that_________.A:good health is more than not being illB:sleeping a lot could be harmfulC:regular health checks are essential to keeping fitD:prevention is more difficult than care
共用题干第二篇As we have seen,the focus of medical care in our society has been shifting from curing disease to preventing disease一especially in terms of changing our many unhealthy behaviors,such as poor eating habits,smoking,and failure to exercise.The line of thought involved in this shift can be pursued further. Imagine a person who is about the right weight , but does not eat very nutritious（有营养的）foods , who feels OK but exercises only occasionally , who goes to work every day , but is not an outstanding worker,who drinks a few beers at home most nights but does not drive while drunk, and who has no chest pains or abnormal blood counts,but sleeps a lot and often feels tired.This person is not ill.He may not even be at risk for any particular disease.But we can imagine that this person could be a lot healthier.The field of medicine has not traditionally distinguished between someone who is merely "not ill" and someone who is in excellent health and pays attention to the body's special needs.Both types have simply been called "well".In recent years,however,some health specialists have begun to apply the terms "well" and "weilness" only to those who are actively striving to maintain and improve their body's condition.Most importantly,perhaps,people who are well take active responsibility for all matters related to their health.Even people who have a physical disease or handicap（缺陷）may be "well" ,in this new sense,if they make an effort to maintain the best possible health they can in the face of their physical limitations."Wellness" may perhaps best be viewed not as a state that people can achieve,but as an ideal that people can strive for. People who are well are likely to be better able to resist disease and to fight disease when it strikes.And by focusing attention on healthy ways of living,the concept of weilness can have a beneficial impact on the way in which people face the challenges of daily life.We can learn from the passage that today medical care focuses on__________.A:curing disease and keeping people in healthy physical conditionsB:monitoring patients' body functionsC:removing peoples' bad living habitsD:ensuring peoples' psychological well-being
共用题干第一篇U. S. States Do Poorly in Women's HealthNot a single U. S. state meets basic federal goals for women's health,and the nation as a whole fails except in two areas一mammograms（乳腺X光照片）and dental（牙齿的） check-ups一researchers said on Thursday.Millions of women lack health insurance,and states make it difficult to enroll（加入）in Medicaid,the state-federal health insurance plan for the poor,according to the report.And few states are doing anywhere near enough to help women quit smoking一the leading cause of death in the United States."The nation as a whole and the individual states fall short of meeting national goals," reads the report,put together by the National Women's Law Center and the Oregon Health&Science University."These health goals provide a road map for assessing the status of women's health."Of 27 measures examined by the group,from screening for diseases to actually treating them,the nation passes on only two,the researchers said."The nation is so far from the health goals that it receives an overall grade of'unsatisfactory',"they wrote.The problem seems to be a lack among states of an overall plan for health in general, the NWLC said." State policy makers' piecemeal（一件一件做的）approach to our health care crisis has resulted in a complex and ineffective system that fails to meet the health care needs of women,"Judy Waxman,NWLC Vice President for Health,said in a statement."Lawmakers need to take a comprehensive,long-term approach to meeting women's health needs and tackle this serious problem that troubles so many families." In which area is the nation successful?A:Dental check-ups. B:Health promotion.C:Disease screening. D:Cancer treatment.
共用题干第二篇As we have seen,the focus of medical care in our society has been shifting from curing disease to preventing disease一especially in terms of changing our many unhealthy behaviors,such as poor eating habits,smoking,and failure to exercise.The line of thought involved in this shift can be pursued further. Imagine a person who is about the right weight , but does not eat very nutritious（有营养的）foods , who feels OK but exercises only occasionally , who goes to work every day , but is not an outstanding worker,who drinks a few beers at home most nights but does not drive while drunk, and who has no chest pains or abnormal blood counts,but sleeps a lot and often feels tired.This person is not ill.He may not even be at risk for any particular disease.But we can imagine that this person could be a lot healthier.The field of medicine has not traditionally distinguished between someone who is merely "not ill" and someone who is in excellent health and pays attention to the body's special needs.Both types have simply been called "well".In recent years,however,some health specialists have begun to apply the terms "well" and "weilness" only to those who are actively striving to maintain and improve their body's condition.Most importantly,perhaps,people who are well take active responsibility for all matters related to their health.Even people who have a physical disease or handicap（缺陷）may be "well" ,in this new sense,if they make an effort to maintain the best possible health they can in the face of their physical limitations."Wellness" may perhaps best be viewed not as a state that people can achieve,but as an ideal that people can strive for. People who are well are likely to be better able to resist disease and to fight disease when it strikes.And by focusing attention on healthy ways of living,the concept of weilness can have a beneficial impact on the way in which people face the challenges of daily life.What is the author's purpose in writing this article?A: To criticize the traditional view of the medical care.B:To compare the differences between the modern medical care and the traditional medical care.C:To tell us the change of the focus of medical care.D:To tell us the importance of the medical care.
共用题干第一篇U. S. States Do Poorly in Women's HealthNot a single U. S. state meets basic federal goals for women's health,and the nation as a whole fails except in two areas一mammograms（乳腺X光照片）and dental（牙齿的） check-ups一researchers said on Thursday.Millions of women lack health insurance,and states make it difficult to enroll（加入）in Medicaid,the state-federal health insurance plan for the poor,according to the report.And few states are doing anywhere near enough to help women quit smoking一the leading cause of death in the United States."The nation as a whole and the individual states fall short of meeting national goals," reads the report,put together by the National Women's Law Center and the Oregon Health&Science University."These health goals provide a road map for assessing the status of women's health."Of 27 measures examined by the group,from screening for diseases to actually treating them,the nation passes on only two,the researchers said."The nation is so far from the health goals that it receives an overall grade of'unsatisfactory',"they wrote.The problem seems to be a lack among states of an overall plan for health in general, the NWLC said." State policy makers' piecemeal（一件一件做的）approach to our health care crisis has resulted in a complex and ineffective system that fails to meet the health care needs of women,"Judy Waxman,NWLC Vice President for Health,said in a statement."Lawmakers need to take a comprehensive,long-term approach to meeting women's health needs and tackle this serious problem that troubles so many families." Which is America's number one killer?A:Stress. B:Heart disease.C:Cancer. D:Smoking.
共用题干第二篇As we have seen,the focus of medical care in our society has been shifting from curing disease to preventing disease一especially in terms of changing our many unhealthy behaviors,such as poor eating habits,smoking,and failure to exercise.The line of thought involved in this shift can be pursued further. Imagine a person who is about the right weight , but does not eat very nutritious（有营养的）foods , who feels OK but exercises only occasionally , who goes to work every day , but is not an outstanding worker,who drinks a few beers at home most nights but does not drive while drunk, and who has no chest pains or abnormal blood counts,but sleeps a lot and often feels tired.This person is not ill.He may not even be at risk for any particular disease.But we can imagine that this person could be a lot healthier.The field of medicine has not traditionally distinguished between someone who is merely "not ill" and someone who is in excellent health and pays attention to the body's special needs.Both types have simply been called "well".In recent years,however,some health specialists have begun to apply the terms "well" and "weilness" only to those who are actively striving to maintain and improve their body's condition.Most importantly,perhaps,people who are well take active responsibility for all matters related to their health.Even people who have a physical disease or handicap（缺陷）may be "well" ,in this new sense,if they make an effort to maintain the best possible health they can in the face of their physical limitations."Wellness" may perhaps best be viewed not as a state that people can achieve,but as an ideal that people can strive for. People who are well are likely to be better able to resist disease and to fight disease when it strikes.And by focusing attention on healthy ways of living,the concept of weilness can have a beneficial impact on the way in which people face the challenges of daily life.According to the second paragraph about the traditional care,which statement is true?A:if the person does not have' any unhealthy living habits,he is considered "well".B:If the person does not have any psychological disease,he is considererd "well".C:If the person could be able to handle his daily routines,he is considererd "well".D:If the nerson could be free from any kind of disease.he is considererd "well".
共用题干第二篇As we have seen,the focus of medical care in our society has been shifting from curing disease to preventing disease一especially in terms of changing our many unhealthy behaviors,such as poor eating habits,smoking,and failure to exercise.The line of thought involved in this shift can be pursued further. Imagine a person who is about the right weight , but does not eat very nutritious（有营养的）foods , who feels OK but exercises only occasionally , who goes to work every day , but is not an outstanding worker,who drinks a few beers at home most nights but does not drive while drunk, and who has no chest pains or abnormal blood counts,but sleeps a lot and often feels tired.This person is not ill.He may not even be at risk for any particular disease.But we can imagine that this person could be a lot healthier.The field of medicine has not traditionally distinguished between someone who is merely "not ill" and someone who is in excellent health and pays attention to the body's special needs.Both types have simply been called "well".In recent years,however,some health specialists have begun to apply the terms "well" and "weilness" only to those who are actively striving to maintain and improve their body's condition.Most importantly,perhaps,people who are well take active responsibility for all matters related to their health.Even people who have a physical disease or handicap（缺陷）may be "well" ,in this new sense,if they make an effort to maintain the best possible health they can in the face of their physical limitations."Wellness" may perhaps best be viewed not as a state that people can achieve,but as an ideal that people can strive for. People who are well are likely to be better able to resist disease and to fight disease when it strikes.And by focusing attention on healthy ways of living,the concept of weilness can have a beneficial impact on the way in which people face the challenges of daily life.According to the author,the true meaning of"weilness"is for people_________.A:to best satisfy their body's special needsB:to strive to maintain the best possible healthC:to meet the strictest standards of bodily healthD:to keep a proper balance between work and leisure
共用题干Health Education1.Health education is the part of health care that is concerned with promoting healthy behavior. A person's behavior may be the main cause of a health problem,but it can also be the main solution. This is true for the teenager who smokes, the mother with the poorly nourished（营养） child, and the butcher（屠夫，卖肉的人）who gets a cut on his finger. By changing their behavior these individuals can solve and prevent many of their own problems.2.Health education does not replace other health services,but it is needed to promote the proper use of these services. One example of this is immunization（免疫）:scientists have made many vaccines（疫苗）to prevent diseases,but this achievement is of no value unless people go to receive immunization.3.Health education encourages behavior that promotes health,prevent illness,cures disease and contributes to recovery. The needs and interests of individuals,families,groups,organizations,and communities are at the heart of health education programs.Thus there are many opportunities for practicing health education.4.Health education is not the same thing as health information.Correct information is certainly a basic part of health education,but health education must also address the other factors that affect health behavior such as availability（可获性）of resources, effectiveness of community leadership, social support from family members,and levels of self-help skills.Health education therefore uses a variety of methods to help people understand their own situations and choose actions that will improvetheir health. Health education is incomplete unless it encourages involvement and choice by the people themselves.5.Also,in health education we do not blame people if they do not behave in a healthy way. Often unhealthy behavior is not the fault of the individual.In health education we must work withfamilies,communities,and even regional authorities to make sure that resources and support are available to enable each individual to lead a healthy life.Individuals should be provided with necessary conditions for______.A:disease preventionB:health educationC:healthy behaviorD:unhealthy behaviorE:other health servicesF: many vaccines
共用题干Health Education1.Health education is the part of health care that is concerned with promoting healthy behavior. A person's behavior may be the main cause of a health problem,but it can also be the main solution. This is true for the teenager who smokes, the mother with the poorly nourished（营养） child, and the butcher（屠夫，卖肉的人）who gets a cut on his finger. By changing their behavior these individuals can solve and prevent many of their own problems.2.Health education does not replace other health services,but it is needed to promote the proper use of these services. One example of this is immunization（免疫）:scientists have made many vaccines（疫苗）to prevent diseases,but this achievement is of no value unless people go to receive immunization.3.Health education encourages behavior that promotes health,prevent illness,cures disease and contributes to recovery. The needs and interests of individuals,families,groups,organizations,and communities are at the heart of health education programs.Thus there are many opportunities for practicing health education.4.Health education is not the same thing as health information.Correct information is certainly a basic part of health education,but health education must also address the other factors that affect health behavior such as availability（可获性）of resources, effectiveness of community leadership, social support from family members,and levels of self-help skills.Health education therefore uses a variety of methods to help people understand their own situations and choose actions that will improvetheir health. Health education is incomplete unless it encourages involvement and choice by the people themselves.5.Also,in health education we do not blame people if they do not behave in a healthy way. Often unhealthy behavior is not the fault of the individual.In health education we must work withfamilies,communities,and even regional authorities to make sure that resources and support are available to enable each individual to lead a healthy life.Health education cannot take the place of______.A:disease preventionB:health educationC:healthy behaviorD:unhealthy behaviorE:other health servicesF: many vaccines
共用题干第三篇Liver DiseaseThe liver is the second largest organ in your body. The liver performs many jobs in your body. It filters harmful substances from the blood,makes substances that digest food,and changes food into energy.One out of every 10 Americans is affected by liver disease.Liver disease is one of the top 10 causes of death in the United States.There are more than 100 liver diseases.Viruses cause some of them,like hepatitis A,hepatitis B and hepatitis C.Others can be the result of drugs,poisons or drinking too much alcohol. If the liver forms scar tissue because of an illness,it's called cirrhosis. Cancer can affect the liver. You could also inherit a liver disease such as hemochromatosis.Liver disease can manifest in many different ways. Characteristic manifestations include jaundice,liver enlargement,portal hypertensionand etc.Sometimes the manifestations of liver disease are not obvious.For example,symptoms may include fatigue,a general feeling of illness,loss of appetite,and mild weight loss. However,people may not notice these symptoms,and these symptoms are also typical of many other diseases.Thus,liver disease can easily be overlooked,particularly in its early stages.Hepatitis A vaccination is the best way to prevent HAV (hepatitis A virus).Hepatitis B vaccination is the best way to prevent HBV.Other ways to stop the spread of HBV are:not sharing needles;practicing safe sex;not sharing razors,toothbrushes,or other personal items;using only clean needles for tattoos and body piercings.There is no vaccine to prevent HCV.The only way to prevent HCV is to avoid direct contact with infected blood.Eating a healthy diet and exercising regularly help the liver to work well. Limit the amount of alcohol you drink.When medicines are taken incorrectly,the liver can be harmed.So follow dosing instructions and talk to a doctor or pharmacist about the medicines you are taking. Mixing alcohol and medicines can harm your liver,even if they are not taken at the same time.Toxins can injure liver cells.So limit direct contact with toxins from cleaning and aerosol products,insecticides, chemicals,and additives in cigarettes.Do not smoke.The word "manifest" in Paragraph 3 could be best replaced by__________.A:disappearB:happenC:showD:cause
共用题干第二篇The Magic of SoundMusic is one of the most beautiful forms of artistic expressions ever invented.In movies and plays, music has an added function:it not only moves people but also can shock people.Our eardrums can withstand sound within 20 to 80 decibels（分贝）.Once sound exceeds this limit , even beautiful music will become ear-splitting noise and harm health.A strong blast（响声）of high sound can twist and break a solid iron sheet.High sound of 150 decibels can kill a healthy rat.In movies,sometimes the hero can produce a sound that ordinary people can't hear and only those whohave the same ability can feel.In nature,there is actually sound that is beyond our hearing.In physics,the sound that exceeds 20,000Hz is called ultrasonic（超音波的）.Dolphins, whales and bats can make such high-frequency sound.It does no harm to health.Sound less than 20Hz is called infrasonic（次声）waves.When we move, the air will vibrate.The vibration of air can produce infrasonic waves.As the frequency of infrasonic waves is close to that of people's internal organs, infrasonic wave may cause resonance（共振）in human bodies.As a result,people's vision may weaken and internal organs may rupture（断裂）.However,whether an infrasonic wave can be used as a weapon depends on its intensity.If its intensity is very low,it won't damage internal organs or a person's health.If the intensity of infrasonic wave exceeds 160 decibels,it is extremely harmful.When wind blows at a force of 3 or 4 over the sea,it will produce infrasonic waves of several decibels.Only typhoons can produce infrasonic waves of over 100 decibels.At present,scientists can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.An ultrasonic sound______.A:is very loudB:does harm to people's healthC:cannot be heard by peopleD:is produced by the hero in movies
共用题干第二篇The Magic of SoundMusic is one of the most beautiful forms of artistic expressions ever invented.In movies and plays, music has an added function:it not only moves people but also can shock people.Our eardrums can withstand sound within 20 to 80 decibels（分贝）.Once sound exceeds this limit , even beautiful music will become ear-splitting noise and harm health.A strong blast（响声）of high sound can twist and break a solid iron sheet.High sound of 150 decibels can kill a healthy rat.In movies,sometimes the hero can produce a sound that ordinary people can't hear and only those whohave the same ability can feel.In nature,there is actually sound that is beyond our hearing.In physics,the sound that exceeds 20,000Hz is called ultrasonic（超音波的）.Dolphins, whales and bats can make such high-frequency sound.It does no harm to health.Sound less than 20Hz is called infrasonic（次声）waves.When we move, the air will vibrate.The vibration of air can produce infrasonic waves.As the frequency of infrasonic waves is close to that of people's internal organs, infrasonic wave may cause resonance（共振）in human bodies.As a result,people's vision may weaken and internal organs may rupture（断裂）.However,whether an infrasonic wave can be used as a weapon depends on its intensity.If its intensity is very low,it won't damage internal organs or a person's health.If the intensity of infrasonic wave exceeds 160 decibels,it is extremely harmful.When wind blows at a force of 3 or 4 over the sea,it will produce infrasonic waves of several decibels.Only typhoons can produce infrasonic waves of over 100 decibels.At present,scientists can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.What does the author say about music?A:It may be harmful to people's health.B:It always cheers people up.C:It is very often difficult to understand.D:It sounds better when it is loud enough.
共用题干第二篇The Magic of SoundMusic is one of the most beautiful forms of artistic expressions ever invented.In movies and plays, music has an added function:it not only moves people but also can shock people.Our eardrums can withstand sound within 20 to 80 decibels（分贝）.Once sound exceeds this limit , even beautiful music will become ear-splitting noise and harm health.A strong blast（响声）of high sound can twist and break a solid iron sheet.High sound of 150 decibels can kill a healthy rat.In movies,sometimes the hero can produce a sound that ordinary people can't hear and only those whohave the same ability can feel.In nature,there is actually sound that is beyond our hearing.In physics,the sound that exceeds 20,000Hz is called ultrasonic（超音波的）.Dolphins, whales and bats can make such high-frequency sound.It does no harm to health.Sound less than 20Hz is called infrasonic（次声）waves.When we move, the air will vibrate.The vibration of air can produce infrasonic waves.As the frequency of infrasonic waves is close to that of people's internal organs, infrasonic wave may cause resonance（共振）in human bodies.As a result,people's vision may weaken and internal organs may rupture（断裂）.However,whether an infrasonic wave can be used as a weapon depends on its intensity.If its intensity is very low,it won't damage internal organs or a person's health.If the intensity of infrasonic wave exceeds 160 decibels,it is extremely harmful.When wind blows at a force of 3 or 4 over the sea,it will produce infrasonic waves of several decibels.Only typhoons can produce infrasonic waves of over 100 decibels.At present,scientists can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.It can be found from the last paragraph that infrasonic waves______.A:are harmless to people's healthB:exist in people's internal organsC:can be used as deadly weaponsD:can improve eyesight
单选题A study by a group of dentists has concluded that regular use of a certain brand of mouthwash is as effective as flossing in preventing gum disease. The mouthwash company has released a television ad suggesting that people who do not like flossing can now rely solely on mouthwash and brushing to maintain good dental health. A leading manufacturer of dental floss brought a lawsuit against the mouthwash company demanding that the advertisement be discontinued on the grounds that it is misleading. Which of the following, if true, provides the strongest support for the dental floss company’s claim that the advertisement is misleading?AThe dental floss manufacturer is concerned that it will lose market share in the dental health market because the advertisement encourages people to switch from dental floss to mouthwash.BThe dental floss company claims in its own advertisements that brushing and flossing after every meal is the most effective way to maintain good dental health.CAlthough mouthwash is an effective deterrent to gum disease, it is less effective than dental floss at removing plaque and preventing cavities between teeth.DPer usage, mouthwash is three times more expensive than dental floss, if the recommended amounts of both products are used.EThe dentists who conducted the study on the effectiveness of mouthwash in preventing gum disease obtained their funding for the study from a company that manufactures mouthwash.
单选题Eating too much fat can devote to heart disease and cause high blood pressure.Aattribute toBattend toCdistribute toDcontribute to
单选题The passage is primarily concerned with which of the following?ADescribing the life cycle of the Plasmodium protozoan as it relates to the disease malariaBComparing and contrasting the life cycles of the six variants of the Plasmodium protozoan known to cause malariaCAddressing the public health implications of the life cycle of the Plasmodium parasiteDProviding information on how a person can avoid infection with malariaEDescribing the life cycle of the Anopheles mosquito as it relates to the transmission of the Plasmodium protozoan to humans
单选题As is well known, eating too much fat can _____ heart disease and cause high blood pressure.Aadd toBattend toCcontribute toDapply to
单选题What is true when designing OSPF import routing policy in JUNOS software?（）AImport policies are not possible.BImport policies only match on external routes.CImport policies only match on internal routes.DImport policies can cause inconsistent link state databases.
单选题A stethoscope can be used to ______.Acheck health conditionsBcure some illnessesCmeasure temperaturesDtreat heart disease
单选题The passage indicates that psychologists _____.Afind it impossible to remove a psychological diseaseBfeel dissatisfied at treating their patients with drugsCbelieve that the root cause of a disease can be ignoredDcan do nothing if the patient is in a depressed state