职称英语阅读理解真题及答案(卫生类A级)
职称英语试题卫生A级阅读理解题
职称英语试题卫生A级阅读理解题阅读判断(第16"----22题，每题l分，共7分)下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A;如果该句提供的是错误信息，请选择B;如果该旬的信息文中没有提及，请选择C。
The Doctor in AmericaSelf-employed private physicians who charge a fee for eachpatient visit have been the norm for American medical practice. Most physicians have a contract relationship with one or more hospitals in their community. They refer their patients as needed to the hospital, which usually charges according to the number of days a patient staysand the facilities -- X-rays,operating rooms, tests -- he or she uses.Some medical doctors are on salary. Salaried physicians may work as hospital staff members, or residents, who are often still in training. They may teach in medical schools, be hired by corporations to care for their workers or work for the federal government's Public Health Service.Physicians are among the best-paid professionals in the United States. In the 1980s, it was not uncommon for medical doctors to, earn incomes of more than $100,000 a year. Specialists,particularly surgeons, might earn several times that amount. Physicians list many reasons why they deserve to be so well rewarded for their work. One reason is the long and expensive preparation required to become a physician in the United States. Most would-be physicians first attend college for four years, which can cost nearly $20,000 a year at one of the best private institutions. Prospective physicians then attend medical school for four years. Tuition alone can exceed $10,000 a year. By the time they have obtained their medical degrees, many young physicians are deeply in debt. They still face three to five years of residency (住院医生实习期) in a hospital, the first year as an apprentice physician. The hours are long and the pay is relatively low.Setting up a medical practice is expensive, too. Sometimes several physicians will decide to establish a group practice, so theycan share the expense of maintaining an office and buying equipment. These physicians also take care of each other's patients in emergencies.Physicians work long hours and must accept a great deal of responsibility. Many medical procedures, even quite routine ones, involve risk. It is understandable that physicians want to be well rewarded for making decisions which can mean the difference between life and death.16. Many physicians in the US are self-employed private physicians.A. RightB. WrongC. Not mentioned17. No salaried physicians teach in medical schools in the US.A. RightB. WrongC. Not mentioned18. Of all employed physicians, those hired by corporations are best paid.A. RightB. WrongC. Not mentioned19. Becoming a physician in the US costs considerable time and money.A. RightB. WrongC. Not mentioned20. Physicians in the US are poorly rewarded for their work.A. RightB. WrongC. Not mentioned21. Anyone with a medical degree can set up a medical practice in the US.A. RightB. WrongC. Not mentioned22. There are more men physicians than women physicians in the US.A. RightB. WrongC. Not ment.ioned参考答案：16.A。
职称英语《卫生A》阅读理解专项试题与答案
职称英语《卫生A》阅读理解专项试题与答案2017职称英语《卫生A》阅读理解专项试题与答案阅读理解text 1U.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 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, 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 Yorkstart signing up pregnant women whose babies will then be followed to age 21.Some of the early findings will be about factors behind pre-term birth, 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.1.The aim of the study is to find new ways to __________.A. conduct researchB. track public healthC. prevent or treat illnessD. speed up development2.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 hospitals3.It is expected that through the study the nation's health care costs __________.A. will be lowered in the long runB. will be significantly increasedC. will be more than $200 millionD. will reach $3.2 billion4.The babies of the participants will be followed__________.A. throughout their livesB. for more than two decadesC. from birth to 21 monthsD. until they get married5.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.text 2Older Volcanic EruptionsVolcanoes were more destructive in ancient history, not because they were bigger, but because the carbon dioxide they released wiped out life with greater ease.Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions. Not all volcanic eruptions killed off large numbers of animals, but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock. To his surprise, the older the massive volcanic eruptions were, the more damage they seemed to do. He calculated the "killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava that they produced. He found that for size, older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.The Permian extinction, for example, which happened 250 million years ago, is marked by floods of volcanic rock in Siberia that cover an area roughly the size of western Europe. Those volcanoes are thought to have pumped out about 10 gigatones of carbon as carbon dioxide. The global warming that followed wiped out 80 percent of all marine genera at the time, and it took 5 million years for the planet to recover. Yet 60 million years ago, there was another huge amount of volcanic activity and global warming but no mass extinction. Some animals did disappear but things returned to normal within ten thousands of years. "Themost recent ones hardly have an effect at all," Wignall says. He ignored the extinction which wiped out the dinosaurs 65 million years ago, because many scientists believe it was primarily caused by the impact of an asteroid. He thinks that older volcanoes had more killing power because more recent life forms were better adapted to dealing with increased levels of CO2.Vincent Courtillot, director of the Paris Geophysical Institute in France, says that Wignall's idea is provocative. But he says it is incredibly hard to do these sorts of calculations. He points out that the killing power of volcanic eruptions depends on how long they lasted. And it is impossible to tell whether the huge blasts lasted for thousands or millions of years. He also adds that it is difficult to estimate how much lava prehistoric volcanoes produced, and that lava volume may not necessarily correspond to carbon dioxide emissions.下载文档。
职称英语考试卫生类A级试题及答案
职称英语考试卫生类A级试题及答案职称英语考试卫生类A级试题及答案第1部分：词汇选择1．The union representative put across her argument very ef fectively.A. inventedB. explainedC. consideredD. accepted2.He talks tough but has a tender heart.A. heavyB. strongC. wildD. kind3.It is no use debating the relative merits of this polic y.A. makingB. takingC. expectingD. discussing4.Our statistics show that we consume all that we are capa ble of producing.A. wasteB. buyC. sellD. use5.The fuel tanks had a capacity of 140 liters.A. functionB. abilityC. volumeD. power6.Our lives are intimately bound up with theirs.A. tenselyB. nearlyC. closelyD. carefully7.Her faith upheld her in times of sadness.A. excitedB. supportedC. inspiredD. directed8.The book provides a concise analysis of the country’s hi story.A. cleanB. perfectC. briefD. real9.It is laid down in the regulations that all members must carry their membership cards at all times.A. suggestedB. warnedC. confirmedD. stated10.The council meeting terminated at 2 o’clock.A. beganB. continuedC. resumedD. ended11.A red flag was placed there as a token of danger.A. substituteB .signC. proofD. target12.However bad the situation is , the majority is unwilling to risk change.A. eagerB. reluctantC. pleasedD. angry13.It has been said that the Acts provided a new course of action and did not merely regulate or enlarge an old one.A. controlB. limitC. replaceD. offset14.The secretary is expected to explore ideas for post-war reconstruction of the area.A. investigateB. denyC. stressD. create15.The steadily rising cost of labor on the waterfront has greatly increased the cost of shipping cargo by water.A. suddenlyB. graduallyC. excessivelyD. exceptionally第2部分：阅读判断阅读下面这篇短文，短文后列出7个句子，请根据短文的内容对每个句子做出判断。
职称英语卫生类A级真题及答案word版4
职称英语卫生类A级真题及答案(word版)(4)四、阅读理解A New Strategy to Overcome Breast CancerPost-menopausal(绝经后)women who walk for an hour a day can cuttheir chance of breast cancer significantly,a study has suggested. The report ,which followed 73,000 women for 17 years,found walking for at least seven hours a week lowered the risk of the disease.The American Cancer Society team said this was the first time reduced risk was specifically linked to walking. UK experts said it was more evidencethat lifestyle influenced cancer risk.A recent poll for the charity Ramblers a quarter of adults walk for no more than an hour a week,but being active is known to reduce the risk of a number of cancers.This study, published in CancerEpidemiology,Biomarkers&Prevention,followed 73.615 women out of 97,785 aged 50-74 who had been recruited by the American Cancer Society between 1992 and 1993,so it could monitor the incidence of cancer in the group.They were asked to complete questionnaires on their health and on how much time they were active and participating in activities such as walking,swimming and aerobics(有氧运动)and how much time they spent sitting watching television or reading.They completed the same questionnaires at two-year intervals between 1997 and 2009.Of the women,47% said walking was their only recreational acivity.Those who walked for at least seven hours per week had a 14% lower risk of breast cancer compared to those who walked three or fewer hours per week.Dr.Alpa Patel,a senior epidemiologist at the American Cancer Society in Atlanta,Georgia,who led the study,said:”Given that more than 60% of women report some daily walking,promoting walking as a healthy leisure-time activity could be an effective strategy for increasing physical activity amongst post-menopausal women.We were pleased to find that without any other recreational activity, just walking one hour a day was associated with a lower risk of breast cancer in these women.””More strenuous(紧张的)and longer activities lowered the risk even more.Baroness Delyth Morgan, chief executive of Breast Cancer Campaign,said:”This study adds further evidence that our lifestyle choices can play a part in influencing the risk of breast cancer and even small changes incorporate into our normal day-to-day activity can make a dif ference.”She added:”We know that the best weapon to overcoming breast cancer is the ability to stop it occurring in the first place. The challenge now is how we turn these findings into action and identify other sustainable lifestyle changes that will hel p us prevent breast cancer.”31. All of the following factors relating to cancer risk were mentioned in the passage______EXCEPT_______A. breathing exerciseB.regular walkingC.recreational activityD.lifestyle choices32. It can be inferred from Dr. Alpa Patel’s study that____.A. women have fewer chances of physical activityB. daily walking could cut the chance of breast cancerC. leisure-time activity is not associated with cancer riskD. walking is not recommended for women with breast cancer33. Dr. Alpa Patel was_____.A. head of the survey studyB. chief editor of Cancer EpidemiologyC. chair of the American Cancer SocietyD. chief executive of Breast Cancer Campaign34. Which of the following statements is true according to the passage?A. Most women take walking as their only recreational activity.B. The study aims to track the health conditions of its subjects.C. Walking was the only recreational acitivity for about half of the womenD. Irregular walking increased the risk of breast cancer in post-menopausal women35. The word “sustainable”in the last paragraph is closest in meaning toA. continuableB. affordableC. availableD. Persistent答案：ABACAFirst Self-contained Heart Implanted 【首例整套人工心脏移植】A patient on the brink of death has received t he world’s firstself-contained artificial heart―a battery-powered device about the size of a softball that runs without the need for wires, tubes or hoses sticking out of the chest.Two surgeons from the University of Louisville implanted thetitanium and plastic pump during a sever-hour operation at Jewish Hospital Monday. The hospital said the patient was “awake and responsive” Tuesday and resting comfortably. It refused to release personal details.The patient had been expected to die within a month without the operation, and doctors said they expected the artificial heart to extend the person’s life by only a month. But the device is considered a major step toward improving the patient’s quality of life.The new pump, called AbioCor, is also a technological leap from the mechanical hearts used in the 1980s, which were attached by wires and tubes to bulky machinery outside the body. The most famous of those, theJarvic-7, used air as a pumping device and was attached to an apparatus about the size of a washing machine.“I think it’s potentially a major step forward in the artificial heart development,” said Dr. David Faxon, president of the American heart Association. However, he said the dream of an implantable, permanent artificial heart is not yet a reality: “This is obviously an experimental device whose long-term success has to be demonstrated.” Only about half of the 4,200 Americans on a waiting list for donor hearts received them last year, and most of the rest died.Some doctors, including Robert Higgins, chairman of cardiology at the Medical College of Virginia in Richmond, said artificial hearts are unlikely to replace donor hears.“A donor heart in a good transplant can last 15 to 30 years,” he said. “It’s going to be hard to replace that with a machine.”The AbilCor has a 2-pound pumping unit, and electronic controls that adjust the pumping speed based on the body’s needs. It is powered by a small battery pack worn outside the body that transmits current through the skin.36. 前两段告诉Self-contained artificial heartA. was made of titanium and pumpB. had brought the patient to the brink of deathC. did not need to get power from outside the bodyD. was invented by two surgeous from university of Louisville37. 病人接收 the first self-contained heartA. could not afford a donor heartB. was said to be in a good condition the next day after the operationC. died two month’s after the heart implantationD. was reluctant to release his or her personal information38. 第四段中the Jarvic-7 isA. the most expensive mechanical heartB. a mechanical heart used in the 1980sC. as advanced as A biocorD. replacing A biocor39. 通过Dr. David Faxon, the self-contained heart isA. a milestone in the artificial heart developmentB. still in the experimental stageC. an implantable, permanent artificial heartD. unavailable to all those Americans waiting for donor hearts40.从文章推断出donor heartA. saved the lives of about 2100 Americans the year before the reportB. will be replaced by self-contained artificial hearts sooner or laterC. are more popular and cheaper than self-contained artificial heartsD. can help patients survive less than 15 years if they are in good transplant.答案：ABBBA。
职称英语卫生类a级考试真题及答案
职称英语卫生类a级考试真题及答案一、词汇选项1.This was disaster on a cosmic scale.A.modestmercialC.hugeD.national2.New secretaries came and went with monotonous regularity.A.amazingB.depressingC.predictableD.dull3.A person’s wealth is often in inverse proportion to their happiness.A.equalB.certainrgeD.opposite4.His professional career spanned 16 years.A.startedB.changedstedD.moved5.The symptoms of the disease manifested themselves ten days later.A.easedB.improvedC.relievedD.appeared6.The group does not advocate the use of violence.A.limitB.supportC.regulateD.oppose7.She talt that she had done her good deed for the day.A.actB.homeworkC.jusuceD.model8.Some of the larget bieds can remain stationary in the air for several minutes.A.motionlessB.sitentC.seatedD.true9.There was an inclination to treat geography as aless imponant Subject.A.pointB.resuitC.findingD.tendency10.His stomach felt hollw with fear.A.sincereB.respectfulC.emptyD.ternbie11.The committee was asked to rendcr a report on the housing situation.A.copyB.publishC.summarizeD.furnish12.That uniform makes the guards look absurd.A.seriousB.beautifulC.impressiveD.ridiculous13.The department deferred the decision for six months.A.put offB.arrived atC.abided byD.protested against14.The original experiment cannot be exactly duplicated.A.inventedB.reproducedC.designedD.reported15.The country was torn apart by strife.A.conflictB.povertyC.warD.economy答案：CDDCD BAADC DDABA二、阅读判断16、The Feed Me Better campaign targeted a healthier diet at school childrenA RightB WrongC Not mentioned17、Everyone believed the campaign should be succeifulA RightB WrongC Not mentioned18、The ISER is an instuteA RightB WrongC Not mentioned19、The puoils in Gtreewwich said they said they liked the healthier mealsA RightB WrongC Not mentioned20、The nwmber of pupils who asked for sick leave decreasedA RightB WrongC Not mentioned21、The ISEK didnot do a comparative study on the impact of the new dietA RightB WrongC Not mentioned22、The healthier diet has helped school childrecn improue academicallyA RightB WrongC Not mentioned三、概括大意Aromatherapy(芳香疗法)1 Aromatherapy is a form of alternative medicine which is based on the use of very concentrated essential oils from the flowers,leaves,bark,branches or roots of plants which are considered to have healing ptoperties.In aromatherapy these powerful oils are mixed with other oils,such as almond(杏仁)oil,or they are diluted(稀释)with water.These solutions(溶液剂)can be rubbed on the skin,sprayed in the air,or applied as a compress(敷药)。
职称英语考试卫生类(A级)真题及答案2
职称英语考试卫生类(A级)真题及答案2第2部分：阅读判断(第16～22题，每题1分，共7分)下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A;如果该句提供的是错误信息，请选择B;如果该句的信息文中没有提及，请选择C。
Sleep Problems Plague the Older SetOlder Americans often have difficulty getting a good night’S rest.It’s a huge quality—of-life problem，experts say，because contrary to popular belief，seniors require about the same amount of sleep as younger adults.“Sleep problems and sleep disorders are not an inherent(固有的)pa rt of aging，”said Dr.Harrison G.Bloom，an associate clinical professor of geriatrics(老年病学)and medicine at the Mount Sinai School of Medicine in New York City.“It’S pretty much of a myth that older people need less sleep than younger people.”(examda)Yet in a study published recently in The American Journal of Medicine，researchers found that more than half of older Americans have problems getting the sleep they need.older people tend to have“sleep fragmentation，”meaning they wake up more often during the night，said study author Dr.Julie Gammck，an assistant professor of medicine in the Division of Geriatric Medicine at St.Louis University.They also seem to get less“REM”sleep，the type of sleep during which rapid eye movement occurs，Bloom added.It’s unclear what role these naturally occurring changes in sleep patterns have on person’s quality of life，Bloom said.“What is important，though，is that older peopleoften have actual sleep disorders and problems with sleep，”he said.And，experts say，there is usually more than one cause.“Slee p trouble in older adults is typically associated with acute and chronic illnesses，including specific sleep disorders like sleep apnea(呼吸暂停)and restless leg syndrome that appear with greater frequency in older populations，”said Michael V.Vitiello , a professor of psychiatry and behavioral sciences and associate director of the University of Washington’S Northwest Geriatric Education Center.Taking multiple medications，as many older people do，can also lead t0 fatigue a“ hypersomnia ，”or being tired all t he time，Bloom added.Another big problem，he noted，IS depression and anxiety.“Those are very commonly associated with sleep problems.”Despite the prevalence(流行)of sleep difficulties in older adults，many patients Aren’t getting the help they need。
职称英语考试卫生类A级阅读练习及答案（参考）
职称英语考试卫生类A级阅读练习及答案（参考）Common Problems, Common SolutionsThe chances are that you made up your mind about smoking a long time ago-and decided it's not for you.The chances are equally good that you know a lot of smokers-there are, after all about 60 millions of them, work with them, play with them, and get along with them very well.And finally it's a pretty safe bet that you're open-minded and interested in all the various issues about smokers and nonsmokers-or you wouldn't be reading this.And those three things make you incredibly important today.Because they mean that yours is the voice-not the smoker's and not the anti-smoker's-that will determine how much of society's efforts should go into building walls that separate us and how much into the search for solutions that bring us together.For one tragic result of the emphasis on building walls is the diversion of millions of dollars from scientific research on the causes and cures of diseases which, when all is said and done, still strike the nonsmoker as well as the smoker. One prominent health organization, to cite but a single instance, now speeds 28 cents of every publicly-contributed dollar on "education"(much of it in anti-smoking propaganda) and only 2 cents on research.There will always be some who want to build walls, who want to separate people from people, and up to a point, even these may serve society. The anti-smoking wall-builders have, to give them their due, helped to make us all more keenly aware of choice.But our guess, and certainly our hope, is that you are among the far greater number who know that walls are only temporaryat best, and that over the long run, we can serve society's interests better by working together in mutual accommodation.Whatever virtue walls may have, they can never move our society toward fundamental solutions. People who work together on common problems, common solutions, can.1. What does the word "wall" used in the passage mean?A) Anti-smoking propaganda.B) Diseases striking nonsmokers as well as smokers.C) Rules and regulations that prohibit smokingD) Separation of smokers from nonsmokers.2. In paragraph 4, "you" refers toA) smokersB) non-smokersC) anti-smokersD) smokers who have quitted smoking3. It is evident that the author is not in favor ofA) building a wall between smokers and nonsmokersB) doing scientific research at the expense of one's healthC) bringing smokers and nonsmokers togetherD) providing accommodation for smokers.4. As is suggested, the common solution to the common problem isA) To separate people from peopleB) To work together in mutual accommodationC) To make us more keenly aware of choiceD) To serve society's interests better.5. According to the passage, the writer looks upon the anti-smoking wall-builder's actionsA) optimisticallyB) pessimisticallyC) unconcernedlyD) skeptically key: DDABD。
2023年职称英语考试卫生类A级新增文章阅读理解和完型填空题
阅读理解第一篇Who Want to Live Forever?If your doctor could give you a drug that would let you live a healthy life for twice as long ，would you take it?The good news is that we may be drawing near to that date，Scientists have already extended the lives of flies ，worms and mice in laboratories. Many now think that using genetic treatments we will soon be able to extend human life to at least 140 years. This seems a great idea. Think of how much more time we could spend chasing our dreams，spending time with our loved ones，watching our families grow and have families of their own."Longer life would give us a chance to recover from our mistakes and promote long term thinking," says Dr Gregory Stock of the University Of California School Of Public Health. "It would also raise productivity by adding to the year we can work."Longer lives don't just affect the people who live them. They also affect society as a whole. "We have war，poverty，all sorts of issues around，and I don't think any of them would be at all helped by having people live longer," says US bioethicist Daniel Callahan."The question is 'What will we get as a society? 'I suspect it won't be a better society."It would certainly be a very different society. People are already finding it more difficult to stay married. Divorce rates are rising. What would happen to marriage in a society where people lived for 140 years? And what would happen to family life if nine or 10 generations of the same family were all alive at the same time?Research into ageing may enable women to remain fertile for longer. And that raises the prospect of having 100-year-old parents，or brothers and sisters born 50 years apart. We think of an elder sibling as someone who can protect us and offer help and advice. That would be hard to do if that sibling came from a completely different generation.Working life would also be affected，especially if the retirement age was lifted. More people would stay in work for longer. That would give us the benefits of age-skill，wisdom and good judgment. On the other hand，more people working for longer would create greater competition for jobs. It would make it more difficult for younger people to find a job. Top posts would be dominated by the same few individuals，making career progress more difficult. And how easily would a 25-year-old employee be able to communicate with a 125-year-old boss?Young people would be a smaller part of a society in which people lived to 140. It may be that such a society would place less importance on guiding and educating young people，and more on making life comfortable for the old.And society would feel very different if more of its members were older. There would be more wisdom，but less energy. Young people like to move about. Old people like to sit still. Young people tend to act without thinking. Old people tend to think without acting. Young people are curious and like to experience different things. Old people are less enthusiastic about change. In fact ，they are less enthusiastic about everything.The effect of anti-ageing technology is deeper than we might think. But as the science advances，we need to think about these changes now. " If this could ever happen，then we'dbetter ask what kind of society we want to get，" says Daniel Callahan. "We had better not go anywhere near it until we have figure those problems out."假如你旳医生给你旳药物，让你过上健康旳2倍旳寿命，你会要吗？好消息是，我们可以亲近，日期，科学家已经延长了生命旳苍蝇，蠕虫和小鼠在试验室。
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职称英语阅读理解真题及答案（卫生类A级）
为大家整理了2013年职称英语阅读理解真题及答案（卫生类A级），仅供参考！！
2013年职称英语卫生类A级阅读理解真题及答案1
DNA is the genetic material found within the cell nuclei of all living things. In mammals the strands of DNA are grouped into structures called chromosomes. With the exception of identical siblings (as in identical twins., the complete DNA of each individual is unique.
DNA fingerprinting is sometimes called DNA typing. It is a method of identification that compares bits of DN A. A DAN fingerprint is constructed by first drawing out a DNA sample from body tissue or fluid such as hair, blood, or saliva. The sample is then segmented using enzymes, and the segments are arranged by size. The segments are marked with probes and exposed on X-ray film, where they form a pattern of black bars—the DNA fingerprint. If the DNA fingerprints produced from two different samples match, the two samples probably came from the same person.
DNA fingerprinting was first developed as an identification technique in 1985. Originally used to detect the presence of genetic diseases, it soon came to be used in criminal investigations and legal affairs. The first criminal conviction based on DNA evidence in the United States occurred in 1988. In criminal investigations, DNA fingerprints derived from evidence collected at the crime scene are compared to the DNA fingerprints of suspects. Generally, courts have accepted the reliability of DNA testing and admitted DNA test results into evidence. However, DNA fingerprinting is controversial in a number of areas: the accuracy of the results, the cost of testing, and the possible misuse of the technique.
The accuracy of DNA fingerprinting has been challenged for several reasons. First,
because DNA segments rather than complete DNA strands are “fingerprinted”; a DNA fingerprint may not be unique; large-scale research to confirm the uniqueness of DNA fingerprinting test results has not been conducted. In addition, DNA fingerprinting is often done in private laboratories that may not follow uniform testing standards and quality controls. Also, since human beings must interpret the test, human error could lead to false results.
DNA fingerprinting is expensive. Suspects who are unable to provide their own DNA to experts may not be able to successfully defend themselves against charges based on DNA evidence.
Widespread use of DNA testing for identification purposes may lead to the establishment of a DNA fingerprint database.
1. According to the essay, we can find chromosomes
A. in a fish.
B. in a tree.
C. in a sheep.
D. in a rock.
2. DNA fingerprinting is more often used for
A. obtaining samples of chromosomes.
B. providing evidence in court investigations.
C. proving the horse to be a mammal.
D. printing books about biology.
3. When your brother looks exactly like you, your complete DNA may be
A. exactly like his.
B. totally different from his.
C. unique.
D. lost.
4. Some people believe that using a DNA fingerprint may not be so reliable because
A. the accuracy of DNA fingerprinting has been challenged.
B. no private laboratory follows uniform testing standards or quality controls.
C. mistakes are possible when researchers explain what have come of their tests.
D. suspects may not have enough money to provide their own DNA to law-courts.
5. This essay talks about DNA fingerprinting concerning the following aspects EXCEPT
A. legal application of the method.
B. the way to obtain a DNA sample.
C. work yet to be done about DNA fingerprinting.
D. possible danger in drawing a DNA sample from the human body.
DNA指纹
DNA是所有生物细胞核子发现的基因材料。
哺乳动物的DNA线被组合为称作染色体的各种结构。
除生物姊妹体外（如完全相同的双胞胎），每一个体的整条DNA是独一无二的。
DNA指纹有时也称作DNA印记法。
这是一种通过比较少量DNA的鉴别方法。
DNA指纹的构成先要从身体组织或液体中抽取DNA标本，如头发、血液或唾液。
采取的标本用酶分割成若干部分，各切片根据大小排列。
切片先用探针做标记，然后曝光于X光片上。
胶片上形成由黑色条纹组成的图案，这就是DNA指纹。
若两个不同标本的DNA指纹完全相像，则这两个标本可能来自同一人。
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