单选题The experts’ study on the problem of erosion can _____.Alead to its eventual solutionBprovide an effective way to slow it downChelp to prevent it from worseningDwarn people whose homes are in danger
单选题
The experts’ study on the problem of erosion can _____.
A
lead to its eventual solution
B
provide an effective way to slow it down
C
help to prevent it from worsening
D
warn people whose homes are in danger
参考解析
解析：
细节推断题。依据第二段第三句，专家们已研究了受影响最大的地区，并为它们绘制了地图，预报在这一年里将被海水吞没的住房房屋，故A项为答案。
细节推断题。依据第二段第三句，专家们已研究了受影响最大的地区，并为它们绘制了地图，预报在这一年里将被海水吞没的住房房屋，故A项为答案。
相关考题：
The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to______.A.precipitate(使沉淀) silica （硅石）from solutionB.reduce corrosion in the heating coilC.prevent clogging and erosion in the coilD.maintain zero water hardness
共用题干第一篇Heat and HealthExtremely hot weather is common in many parts of the world.Although hot weather just makes most people hot,it can cause medical problems and death.Health experts say that since the year 1900,extremely hot weather has killed more people in the United States than any other natural event.One year一the unusually hot summer of 1980一heat caused about 1,700 deaths in the United States.In 1995,more than 600 people died in a similar heat wave in one city一Chicago.To measure extreme heat,government weather experts have developed the Mean Heat Index.It measures the average of how hot it is felt all day on an extremely hot day.Experts say it is the total heat of a hot day or several hot days that can affect health.Several hot days are considered a heat wave.Experts say heat waves often become deadly when the nighttime temperature does not drop much from the highest daytime temperature.The most common medical problem caused by hot weather is heat stress.It is also least severe.For most people,the only result of heat stress is muscle pain.The pain is a warning that the body is becoming too hot. Doctors say drinking water will help the pain disappear after the body again has the right amounts of water and salt.For some people, however,the result is much more serious.For example,doctors say some people face a greatly increased danger from heat stress.These people have a weak or damaged heart,high blood pressure,or other problems of the blood system.Severe heat can help cause a heart attack or stroke.Health experts say this is the most common cause of death linked to hot weather. How many people died from heat in Chicago in 1995?A: About 1700. B: Nearly 1900.C: Around 1100. D: Over 600.
The Norwegian Government has tried to ______.A. encourage the oil companies to discover new oil sourcesB. prevent oil companies employing people from northern NorwayC. help the oil companies solve many of their problemsD. keep the oil industry to something near its present size
共用题干第一篇U. S. to Start $3.2 Billion Child Health Study in JanuaryA study that will cost $3.2 billion and last more than two decades to track the health of 100,000 U.S.children from before birth to age 21 will be launched in January,U.S.health officials said on Friday.Officials from the U.S. government's National Institutes of Health said they hope the study,to be conducted at 105 locations throughout the United States,can help identify early-life influences that affect later development,with the goal of learning new ways to treat or prevent illness.The study will examine hereditary（遗传的）and environmental factors such as exposure to certain chemicals that affect health.Researchers will collect genetic and biological samples from people in the study as well as samples from the homes of the women and their babies including air,water,dust and materials used to construct their residences,the NIH said.Officials said more than $200 million has been spent already and the study is projected to cost $3.2 billion."We anticipate that in the long term（从长远说来）,what we learn from the study will result in a significant savings in the nation's health care costs,"Dr. Duane Alexander,who heads the NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development,told reporters.The study will begin in January when the University of North Carolina and the Mount Sinai School of Medicine in New York start signing up（使报名从事）pregnant women whose babies will then be followed to age 21.Some of the early findings will be about factors behind pre-term birth（早产）,which has become more common in recent years,according to Dr. Peter Scheidt of the NIH,who heads the study.The people taking part will be from rural,urban and suburban areas,from all income and educational levels and from all racial groups,the NIH said.Researchers will collect all the following EXCEPT__________.A:genetic samples from people in the studyB:biological samples from people in the studyC:samples from the homes of the women and their babiesD:samples of air and water from hospitals
共用题干第一篇U. S. to Start $3.2 Billion Child Health Study in JanuaryA study that will cost $3.2 billion and last more than two decades to track the health of 100,000 U.S.children from before birth to age 21 will be launched in January,U.S.health officials said on Friday.Officials from the U.S. government's National Institutes of Health said they hope the study,to be conducted at 105 locations throughout the United States,can help identify early-life influences that affect later development,with the goal of learning new ways to treat or prevent illness.The study will examine hereditary（遗传的）and environmental factors such as exposure to certain chemicals that affect health.Researchers will collect genetic and biological samples from people in the study as well as samples from the homes of the women and their babies including air,water,dust and materials used to construct their residences,the NIH said.Officials said more than $200 million has been spent already and the study is projected to cost $3.2 billion."We anticipate that in the long term（从长远说来）,what we learn from the study will result in a significant savings in the nation's health care costs,"Dr. Duane Alexander,who heads the NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development,told reporters.The study will begin in January when the University of North Carolina and the Mount Sinai School of Medicine in New York start signing up（使报名从事）pregnant women whose babies will then be followed to age 21.Some of the early findings will be about factors behind pre-term birth（早产）,which has become more common in recent years,according to Dr. Peter Scheidt of the NIH,who heads the study.The people taking part will be from rural,urban and suburban areas,from all income and educational levels and from all racial groups,the NIH said.The aim of the study is to find new ways to_______.A:conduct research B:track public healthC:prevent or treat illness D:speed up development
共用题干第一篇U. S. to Start $3.2 Billion Child Health Study in JanuaryA study that will cost $3.2 billion and last more than two decades to track the health of 100,000 U.S.children from before birth to age 21 will be launched in January,U.S.health officials said on Friday.Officials from the U.S. government's National Institutes of Health said they hope the study,to be conducted at 105 locations throughout the United States,can help identify early-life influences that affect later development,with the goal of learning new ways to treat or prevent illness.The study will examine hereditary（遗传的）and environmental factors such as exposure to certain chemicals that affect health.Researchers will collect genetic and biological samples from people in the study as well as samples from the homes of the women and their babies including air,water,dust and materials used to construct their residences,the NIH said.Officials said more than $200 million has been spent already and the study is projected to cost $3.2 billion."We anticipate that in the long term（从长远说来）,what we learn from the study will result in a significant savings in the nation's health care costs,"Dr. Duane Alexander,who heads the NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development,told reporters.The study will begin in January when the University of North Carolina and the Mount Sinai School of Medicine in New York start signing up（使报名从事）pregnant women whose babies will then be followed to age 21.Some of the early findings will be about factors behind pre-term birth（早产）,which has become more common in recent years,according to Dr. Peter Scheidt of the NIH,who heads the study.The people taking part will be from rural,urban and suburban areas,from all income and educational levels and from all racial groups,the NIH said.Which is NOT true of the people in the study?A:They'll be from various areas.B:They'll be from all income levels.C:They'll be from all educational levels.D:They'll be from all age groups.
共用题干第二篇Solving a problem can be broken down into several steps.First,the problem must be identified correctly.Psychologists refer to this step as problem representation.For many problems,a figuring out which information is relevant and which is irrelevant can be difficult and can interfere with arriving at a good solution.Clearly,a problem can be solved,it must be obvious what the problem is; however,this is not as easy as it might seem.One obstacle to efficient problem representation is functional fixedness,that is,allowing preconceived notions and even prejudices to color the facts. Most people tend to see objects and events in certain fixed ways,and by being inflexible in viewing the problem,they may be unable to notice the tools for the solution.Once the problem is identified accurately,however,the second step consists of considering the alternatives for a solution.A common way to evaluate alternatives is to write them down and then make a list of advantages and disadvantages for each solution. Here again,people may be limited by prior experiences.Often people adopt mental sets that lead them to the same problem-solving strategies that were successful for problems in the past. Although that can be helpful most of the time, sometimes a new situation requires a different strategy. In that case,the mental set must be abandoned,and new alternatives must be explored.This can be a difficult adjustment for some people.After the alternatives have been compared,a strategy must be selected from among them.One way to avoid becoming stuck in the options is to try the best option with a view to abandoning it for another if the results are unfavorable.This attitude allows many people to move on expeditiously to the next step—action.The strategy selected must be implemented and tested.If it solves the problem,no further action is necessary,but if not,then an unsuccessful solution may actually lead to a more successful option.If the solution is still not apparent,then the cycle begins again,starting with problem identification.By continuing to review the problem and repeat the problem-solving steps,the solution can be improved upon and refined.One way to avoid being stuck in the different options to solve the problem is to________.A:stick to the best optionB:compare the advantages and disadvantages of different optionsC:ask other people for adviceD:try the best option but be ready to abandon it once it turns out to be not good
共用题干第二篇Solving a problem can be broken down into several steps.First,the problem must be identified correctly.Psychologists refer to this step as problem representation.For many problems,a figuring out which information is relevant and which is irrelevant can be difficult and can interfere with arriving at a good solution.Clearly,a problem can be solved,it must be obvious what the problem is; however,this is not as easy as it might seem.One obstacle to efficient problem representation is functional fixedness,that is,allowing preconceived notions and even prejudices to color the facts. Most people tend to see objects and events in certain fixed ways,and by being inflexible in viewing the problem,they may be unable to notice the tools for the solution.Once the problem is identified accurately,however,the second step consists of considering the alternatives for a solution.A common way to evaluate alternatives is to write them down and then make a list of advantages and disadvantages for each solution. Here again,people may be limited by prior experiences.Often people adopt mental sets that lead them to the same problem-solving strategies that were successful for problems in the past. Although that can be helpful most of the time, sometimes a new situation requires a different strategy. In that case,the mental set must be abandoned,and new alternatives must be explored.This can be a difficult adjustment for some people.After the alternatives have been compared,a strategy must be selected from among them.One way to avoid becoming stuck in the options is to try the best option with a view to abandoning it for another if the results are unfavorable.This attitude allows many people to move on expeditiously to the next step—action.The strategy selected must be implemented and tested.If it solves the problem,no further action is necessary,but if not,then an unsuccessful solution may actually lead to a more successful option.If the solution is still not apparent,then the cycle begins again,starting with problem identification.By continuing to review the problem and repeat the problem-solving steps,the solution can be improved upon and refined.Solving a problem can be broken down into_______steps.A:3 B:4 C:5 D:6
共用题干第二篇Solving a problem can be broken down into several steps.First,the problem must be identified correctly.Psychologists refer to this step as problem representation.For many problems,a figuring out which information is relevant and which is irrelevant can be difficult and can interfere with arriving at a good solution.Clearly,a problem can be solved,it must be obvious what the problem is; however,this is not as easy as it might seem.One obstacle to efficient problem representation is functional fixedness,that is,allowing preconceived notions and even prejudices to color the facts. Most people tend to see objects and events in certain fixed ways,and by being inflexible in viewing the problem,they may be unable to notice the tools for the solution.Once the problem is identified accurately,however,the second step consists of considering the alternatives for a solution.A common way to evaluate alternatives is to write them down and then make a list of advantages and disadvantages for each solution. Here again,people may be limited by prior experiences.Often people adopt mental sets that lead them to the same problem-solving strategies that were successful for problems in the past. Although that can be helpful most of the time, sometimes a new situation requires a different strategy. In that case,the mental set must be abandoned,and new alternatives must be explored.This can be a difficult adjustment for some people.After the alternatives have been compared,a strategy must be selected from among them.One way to avoid becoming stuck in the options is to try the best option with a view to abandoning it for another if the results are unfavorable.This attitude allows many people to move on expeditiously to the next step—action.The strategy selected must be implemented and tested.If it solves the problem,no further action is necessary,but if not,then an unsuccessful solution may actually lead to a more successful option.If the solution is still not apparent,then the cycle begins again,starting with problem identification.By continuing to review the problem and repeat the problem-solving steps,the solution can be improved upon and refined.We can evaluate the alternatives for a solution by_________.A:using prior experiencesB:adopting mental setsC:abandoning mental setsD:writing down the advantages and disadvantages of each solution
共用题干第二篇Solving a problem can be broken down into several steps.First,the problem must be identified correctly.Psychologists refer to this step as problem representation.For many problems,a figuring out which information is relevant and which is irrelevant can be difficult and can interfere with arriving at a good solution.Clearly,a problem can be solved,it must be obvious what the problem is; however,this is not as easy as it might seem.One obstacle to efficient problem representation is functional fixedness,that is,allowing preconceived notions and even prejudices to color the facts. Most people tend to see objects and events in certain fixed ways,and by being inflexible in viewing the problem,they may be unable to notice the tools for the solution.Once the problem is identified accurately,however,the second step consists of considering the alternatives for a solution.A common way to evaluate alternatives is to write them down and then make a list of advantages and disadvantages for each solution. Here again,people may be limited by prior experiences.Often people adopt mental sets that lead them to the same problem-solving strategies that were successful for problems in the past. Although that can be helpful most of the time, sometimes a new situation requires a different strategy. In that case,the mental set must be abandoned,and new alternatives must be explored.This can be a difficult adjustment for some people.After the alternatives have been compared,a strategy must be selected from among them.One way to avoid becoming stuck in the options is to try the best option with a view to abandoning it for another if the results are unfavorable.This attitude allows many people to move on expeditiously to the next step—action.The strategy selected must be implemented and tested.If it solves the problem,no further action is necessary,but if not,then an unsuccessful solution may actually lead to a more successful option.If the solution is still not apparent,then the cycle begins again,starting with problem identification.By continuing to review the problem and repeat the problem-solving steps,the solution can be improved upon and refined.If we want to solve a problem,the first step is to________.A:know what the problem is B:compare the alternativesC:use prior experiences D:select a strategy
共用题干第二篇Solving a problem can be broken down into several steps.First,the problem must be identified correctly.Psychologists refer to this step as problem representation.For many problems,a figuring out which information is relevant and which is irrelevant can be difficult and can interfere with arriving at a good solution.Clearly,a problem can be solved,it must be obvious what the problem is; however,this is not as easy as it might seem.One obstacle to efficient problem representation is functional fixedness,that is,allowing preconceived notions and even prejudices to color the facts. Most people tend to see objects and events in certain fixed ways,and by being inflexible in viewing the problem,they may be unable to notice the tools for the solution.Once the problem is identified accurately,however,the second step consists of considering the alternatives for a solution.A common way to evaluate alternatives is to write them down and then make a list of advantages and disadvantages for each solution. Here again,people may be limited by prior experiences.Often people adopt mental sets that lead them to the same problem-solving strategies that were successful for problems in the past. Although that can be helpful most of the time, sometimes a new situation requires a different strategy. In that case,the mental set must be abandoned,and new alternatives must be explored.This can be a difficult adjustment for some people.After the alternatives have been compared,a strategy must be selected from among them.One way to avoid becoming stuck in the options is to try the best option with a view to abandoning it for another if the results are unfavorable.This attitude allows many people to move on expeditiously to the next step—action.The strategy selected must be implemented and tested.If it solves the problem,no further action is necessary,but if not,then an unsuccessful solution may actually lead to a more successful option.If the solution is still not apparent,then the cycle begins again,starting with problem identification.By continuing to review the problem and repeat the problem-solving steps,the solution can be improved upon and refined.Which of the following has the same meaning as "interfere with" in Para. 1 Line 3?A:help with B:disruptC:interact with D:interrupt
共用题干第一篇US to Start $3.2 Billion Child Health Study in JanuaryA study that will cost$3.2 billion and last more than two decades to track the health of 100,000 US children from before birth to age 21 will be launched in January,US health officials said on Friday.Officials from the US government's National Institutes of Health said they hope the study,to be conducted at 105 locations throughout the United States,can help identify early-life influences that affect later development,with the goal of learning new ways to treat or prevent illness.The study will examine hereditary（遗传的）and environmental factors such as exposure to certain chemicals that affect health.Researchers will collect genetic and biological samples from people in the study as well as samples from the homes of the women and their babies including air,water,dust and materials used to construct their residences,the NIH said.Officials said more than $200 million has been spent already and the study is projected to cost$3.2 billion."We anticipate that in the long term（从长远来说）,what we learn from the study will result in a significant savings in the nation's health care costs,"Dr. Duane Alexander,who heads the NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development,told reporters.The study will begin in January when the University of North Carolina and the Mount Sinai School of Medicine in New York start signing up（签订协议）pregnant women whose babies will then be followed to age 21.Some of the early findings will be about factors behind pre-term birth（早产）,which has become more common in recent years,according to Dr. Peter Scheidt of the NIH,who heads the study.The people taking part will be from rural,urban and suburban areas,from all income and educational levels and from all racial groups,the NIH said.Researchers will collect all the following EXCEPT______.A:genetic samples from people in the studyB:biological samples from people in the studyC:samples from the homes of the women and their babiesD:samples of air and water from hospitals
共用题干第一篇US to Start $3.2 Billion Child Health Study in JanuaryA study that will cost$3.2 billion and last more than two decades to track the health of 100,000 US children from before birth to age 21 will be launched in January,US health officials said on Friday.Officials from the US government's National Institutes of Health said they hope the study,to be conducted at 105 locations throughout the United States,can help identify early-life influences that affect later development,with the goal of learning new ways to treat or prevent illness.The study will examine hereditary（遗传的）and environmental factors such as exposure to certain chemicals that affect health.Researchers will collect genetic and biological samples from people in the study as well as samples from the homes of the women and their babies including air,water,dust and materials used to construct their residences,the NIH said.Officials said more than $200 million has been spent already and the study is projected to cost$3.2 billion."We anticipate that in the long term（从长远来说）,what we learn from the study will result in a significant savings in the nation's health care costs,"Dr. Duane Alexander,who heads the NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development,told reporters.The study will begin in January when the University of North Carolina and the Mount Sinai School of Medicine in New York start signing up（签订协议）pregnant women whose babies will then be followed to age 21.Some of the early findings will be about factors behind pre-term birth（早产）,which has become more common in recent years,according to Dr. Peter Scheidt of the NIH,who heads the study.The people taking part will be from rural,urban and suburban areas,from all income and educational levels and from all racial groups,the NIH said.Which is NOT true of the people in the study?A:They'll be from various areas.B:They'll be from all income levels.C:They'll be from all educational levels.D:They'll be from all age groups.
共用题干第一篇US to Start$3.2 Billion Child Health Study in JanuaryA stu街that will cost $3.2 billion and last more than two decades to track the health of 100,000 US children from before birth to age 21 will be launched in January,US health officials said on Friday.Officials from the US government's National Institutes of Health said they hope the study,to be conducted at 105 locations throughout the United States,can help identify early-life influences that affect later development,with the goal of learning new ways to treat or prevent illness.The study will examine hereditary（遗传的）and environmental factors such as exposure to certamn chemicals that affect health.Researchers will collect genetic and biological samples from people in the study as well as samples from the homes of the women and their babies including air,water,dust and materials used to construct their residences,the NIH said.Officials said more than $200 million has been spent already and the study is projected to cost $3.2 billion."We anticipate that in the long term（从长远说来）,what we learn from the study will result in a significant savings in the nation's health care costs,"Dr. Duane Alexander,who heads the NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development,told reporters.The study will begin in January when the University of North Carolina and the Mount Sinai School of Medicine in New York start signing up pregnant women whose babies will then be followed to age 21.Some of the early findings will be about factors behind preterm birth（早产）,which has become more common in recent years,according to Dr. Peter Scheidt of the NIH,who heads the study.The people taking part will be from rural,urban and suburban areas,from all income and educational levels and from all racial groups,the NIH said.The aim of the study is to find new ways to_______.A:conduct researchB:track public healthC:prevent or treat illnessD:speed up development
共用题干第一篇US to Start$3.2 Billion Child Health Study in JanuaryA stu街that will cost $3.2 billion and last more than two decades to track the health of 100,000 US children from before birth to age 21 will be launched in January,US health officials said on Friday.Officials from the US government's National Institutes of Health said they hope the study,to be conducted at 105 locations throughout the United States,can help identify early-life influences that affect later development,with the goal of learning new ways to treat or prevent illness.The study will examine hereditary（遗传的）and environmental factors such as exposure to certamn chemicals that affect health.Researchers will collect genetic and biological samples from people in the study as well as samples from the homes of the women and their babies including air,water,dust and materials used to construct their residences,the NIH said.Officials said more than $200 million has been spent already and the study is projected to cost $3.2 billion."We anticipate that in the long term（从长远说来）,what we learn from the study will result in a significant savings in the nation's health care costs,"Dr. Duane Alexander,who heads the NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development,told reporters.The study will begin in January when the University of North Carolina and the Mount Sinai School of Medicine in New York start signing up pregnant women whose babies will then be followed to age 21.Some of the early findings will be about factors behind preterm birth（早产）,which has become more common in recent years,according to Dr. Peter Scheidt of the NIH,who heads the study.The people taking part will be from rural,urban and suburban areas,from all income and educational levels and from all racial groups,the NIH said.Researchers will collect all the following EXCEPT_______.A:genetic samples from people in the studyB:biological samples from people in the studyC:samples from the homes of the women and their babiesD:samples of air and water from hospitals
共用题干第一篇US to Start$3.2 Billion Child Health Study in JanuaryA stu街that will cost $3.2 billion and last more than two decades to track the health of 100,000 US children from before birth to age 21 will be launched in January,US health officials said on Friday.Officials from the US government's National Institutes of Health said they hope the study,to be conducted at 105 locations throughout the United States,can help identify early-life influences that affect later development,with the goal of learning new ways to treat or prevent illness.The study will examine hereditary（遗传的）and environmental factors such as exposure to certamn chemicals that affect health.Researchers will collect genetic and biological samples from people in the study as well as samples from the homes of the women and their babies including air,water,dust and materials used to construct their residences,the NIH said.Officials said more than $200 million has been spent already and the study is projected to cost $3.2 billion."We anticipate that in the long term（从长远说来）,what we learn from the study will result in a significant savings in the nation's health care costs,"Dr. Duane Alexander,who heads the NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development,told reporters.The study will begin in January when the University of North Carolina and the Mount Sinai School of Medicine in New York start signing up pregnant women whose babies will then be followed to age 21.Some of the early findings will be about factors behind preterm birth（早产）,which has become more common in recent years,according to Dr. Peter Scheidt of the NIH,who heads the study.The people taking part will be from rural,urban and suburban areas,from all income and educational levels and from all racial groups,the NIH said.Which is not true of the people in the study?A:They'll be from various areas.B:They'll be from all income levels.C:They'll be from all educational levels.D:They'll be from all age groups.
The network administrator has enabled BPDU guard on the LAN. Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？ （）A、BPDU guard can be used to prevent invalid BPDUs from propagating throughout the network. B、BPDU guard can guarantee proper selection of the root bridge.C、BPDU guard can be utilized to prevent the switch from transmitteing BPDUs and incorrectly altering the root bridge election.D、BPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the port.E、None of the other alternatives apply
单选题The experts’ study on the problem of erosion can _____.Alead to its eventual solutionBprovide an effective way to slow it downChelp to prevent it from worseningDwarn people whose homes are in danger
问答题With computers, people can now shop, bank, work and communicate from the home. The danger is that people could become isolated from each other and lose social skills which help them to get along with others. To what extent do you agree or disagree with this opinion? Write a composition of about 400 words to discuss this topic.
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It can be seen from the passage that the expansion of America’s elderly population _____.Awill provide good job opportunities in many areasBwill impose an unbearable burden on societyCmay lead to nursing home abuse and age discriminationDwill create new field of study in universities
单选题Falls in the bathroom are considered to be unfortunate because _____.Athey can easily be avoidedBold people seldom fall in bathroomsCgrab bars do not help to prevent fallsDbathroom accidents are difficult to prevent
单选题The Recording Industry Association of AmericaApersuaded people to download its music from the Internet.Bis trying to stop people stealing their music stored in the computer.Cstarted suing people playing their music to the public.Dhas taken effective measures to dissuade people downloading music from the Internet.
填空题The quick-growing exotic tree species are replanted in the deforested land because they can help prevent soil erosion.____
判断题Scientists study the development of expertise in different areas so that their findings can help children in becoming experts in these and other areas.A对B错
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.
单选题The network administrator has enabled BPDU guard on the LAN. Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？ （）ABPDU guard can be used to prevent invalid BPDUs from propagating throughout the network. BBPDU guard can guarantee proper selection of the root bridge.CBPDU guard can be utilized to prevent the switch from transmitteing BPDUs and incorrectly altering the root bridge election.DBPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the port.ENone of the other alternatives apply
单选题What can be inferred from the passage?ALacking love can lead young people to grow up more quickly.BThe older a woman is, the less likely she seems to lose herself in romance.CEarly love makes young people keep close to their friends and parents.DParents should help their children to be aware of the signs of depression.