1、Questions 21 to 25 are based on the following passage.For years, doctors advised their patients that the only thing taking multivitamins does is give them extensive urine (尿). After all, true vitamin deficiencies are practically unheard of in industrialized countries. Now it seems those doctors may
2、have been wrong. The results of a growing number of studies suggest that even a modest vitamin shortfall can be harmful to your health. Although proof of the benefits of multivitamins is still far from certain, the few dollars you spend on them is probably a good investment.Or at least thats the arg
3、ument put forward in the New England Journal of Medicine. Ideally, say Dr. Walter Willett and Dr. Meir Stampfer of Harvard, all vitamin supplements would be evaluated in scientifically rigorous clinical trials.But those studies can take a long time and often raise more questions than they answer. At
4、 some point, while researchers work on figuring out where the truth lies, it just makes sense to say the potential benefit outweighs the cost.The best evidence to date concerns folate, one of the B vitamins. Its been proved to limit the number of defects in embryos (胚胎), and a recent trial found tha
5、t folate in combination with vitamin B 12 and a form of B6 also decreases the re-blockage of arteries after surgical repair.The news on vitamin E has been more mixed. Healthy folks who take 400 international units daily for at least two years appear somewhat less likely to develop heart disease. But
6、 when doctors give vitamin E to patients who already have he art disease, the vitamin doesnt seem to help. It may turn out that vitamin E plays a role in prevention but cannot undo serious damage.Despite vitamin Cs great popularity, consuming large amounts of it still has not been positively linked
7、to any great benefit. The body quickly becomes saturated with C and simply excretes (排泄) any excess.The multivitamins question boils down to this: Do you need to wait until all the evidence is in before you take them, or are you willing to accept that theres enough evidence that they dont hurt and c
8、ould help?If the latter, theres no need to go to extremes and buy the biggest horse pills or the most expensive bottles. Large doses can cause trouble, including excessive bleeding and nervous system problems.Multivitamins are no substitute for exercise and a balanced diet, of course.As long as you
9、understand that any potential benefit is modest and subject to further refinement, taking a daily multivitamin makes a lot of sense.21. At one time doctors discouraged taking multivitamins because they believed that multivitamins _.A) could not easily be absorbed by the human bodyB) were potentially
10、 harmful to peoples healthC) were too expensive for daily consumptionD) could not provide any cure for vitamin deficiencies（A）22. According to the author, clinical trials of vitamin supplements _.A) often result in misleading conclusionsB) take time and will not produce conclusive resultsC) should b
11、e conducted by scientists on a larger scaleD) appear to be a sheer waste of time and resources（B）23. It has been found that vitamin E _.A) should be taken by patients regularly and persistentlyB) can effectively reduce the recurrence of heart diseaseC) has a preventive but not curative effect on hea
12、rt diseaseD) should be given to patients with heart disease as early as possible（C ）24. It can be seen that large doses of multivitamins _.A) may bring about serious side effectsB) may help prevent excessive bleedingC) are likely to induce the blockage of arteriesD) are advisable for those with vita
13、min deficiencies（A）25. The author concludes the passage with the advice that _.A) the benefit of daily multivitamin intake outweighs that of exercise and a balanced dietB) its risky to take multivitamins without knowing their specific functionC) the potential benefit of multivitamins can never be ov
14、erestimatedD) its reasonable to take a rational dose of multivitamins dailyQuestions 26 to 30 are based on the following passage.Some futurologists have assumed that the vast upsurge (剧增) of women in the workforce may portend a rejection of marriage. Many women, according to this hypothesis, would r
15、ather work than marry. The converse (反面) of this concern is that the prospects of becoming a multi-paycheck household could encourage marriages. In the past, only the earnings and financial prospects of the man counted in the marriage decision. Now, however, the earning ability of a woman can make h
16、er more attractive as a marriage partner. Data show that economic downturns tend to postpone marriage because the parties cannot afford to establish a family or are concerned about rainy days ahead. As the economy rebounds, the number of marriages also rises.Coincident with the increase in women wor
17、king outside the home is the increase in divorce rates. Yet, it may be wrong to jump to any simple cause-and-effect conclusions. The impact of a wifes work on divorce is no less cloudy than its impact on marriage decisions. The realization that she can be a good provider may increase the chances tha
18、t a working wife will choose divorce over an unsatisfactory marriage. But the reverse is equally plausible. Tensions grounded in financial problems often play a key role in ending a marriage. Given high unemployment, inflationary problems, and slow growth in real earnings, a working wife can increas
19、e household income and relieve some of these pressing financial burdens. By raising a familys standard of living, a working wife may strengthen her familys financial and emotional stability.Psychological factors also should be considered. For example, a wife blocked from a career outside the home ma
20、y feel caged in the house. She may view her only choice as seeking a divorce.On the other hand, if she can find fulfillment through work outside the home, work and marriage can go together to create a stronger and more stable union.Also, a major part of womens inequality in marriage has been due to
21、the fact that, in most cases, men have remained the main breadwinners. With higher earning capacity and status occupations outside of the home comes the capacity to exercise power within the family. A working wife may rob a husband of being the master of the house. Depending upon how the couple reac
22、ts to these new conditions, it could create a stronger equal partnership or it could create new insecurities.26. The word “portend” (Line 2, Para. 1) is closest in meaning to “_”.A) defyB) signalC) suffer fromD) result from（B）27. It is said in the passage that when the economy slides, _.A) men would
23、 choose working women as their marriage partnersB) more women would get married to seek financial securityC) even working women would worry about their marriagesD) more people would prefer to remain single for the time being（D）28. If women find fulfillment through work outside the home, _.A) they ar
24、e more likely to dominate their marriage partnersB) their husbands are expected to do more houseworkC) their marriage ties can be strengthenedD) they tend to put their career before marriage（C）29. One reason why women with no career may seek a divorce is that _.A) they feel that they have been robbe
25、d of their freedomB) they are afraid of being bossed around by their husbandsC) they feel that their partners fail to live up to their expectationsD) they tend to suspect their husbands loyalty to their marriage（A）30. Which of the following statements can best summarize the authors view in the passa
26、ge?A) The stability of marriage and the divorce rate may reflect the economic situation of the country.B) Even when economically independent, most women have to struggle for real equality in marriage.C) In order to secure their marriage women should work outside the home and remain independent.D) Th
27、e impact of the growing female workforce on marriage varies from case to case.Questions 31 to 35 are based on the following passage.For most thinkers since the Greek philosophers, it was self-evident that the re is something called human nature, something that constitutes the essence of man. There w
28、ere various views about what constitutes it, but there was agreement that such an essence existsthat is to say, that there is something by virtue of which man is man. Thus man was defined as a rational being, as a social animal, an animal that can make tools, or a symbol-making animal.More recently,
29、 this traditional view has begun to be questioned. One reason for this change was the increasing emphasis given to the historical approach to man. An examination of the history of humanity suggested that man in our epoch is so different from man in previous times that it seemed unrealistic to assume
30、 that men in every age have had in common something that can be called “human nature.” The historical approach was reinforced, particularly in the United States, by studies in the field of cultural anthropology (人类学). The study of primitive peoples has discovered such a diversity of customs, values,
31、 feelings, and thoughts that many anthropologists arrived at the concept that man is born as a blank sheet of paper on which each culture writes its text. Another factor contributing to the tendency to deny the assumption of a fixed human nature was that the concept has so often been abused as a shi
32、eld behind which the most inhuman acts are committed. In the name of human nature, for example, Aristotle and most thinkers up to the eighteenth century defended slavery. Or in order to prove the rationality and necessity of the capitalist form of society, scholars have tried to make a case for acqu
33、isitiveness, competitiveness, and selfishness as innate (天生的) human traits. Popularly, one refers cynically to “human nature” in accepting the inevitability of such undesirable human behavior as greed, murder, cheating and lying.Another reason for skepticism about the concept of human nature probabl
34、y lies in the influence of evolutionary thinking. Once man came to be seen as developing in the process of evolution, the idea of a substance which is contained in his essence seemed untenable. Yet I believe it is precisely from an evolutionary standpoint that we can expect new insight into the prob
35、lem of the nature of man.31. The traditional view of “human nature” was strongly challenged by _.A) the emergence of the evolutionary theoryB) the historical approach to manC) new insight into human behaviorD) the philosophical analysis of slavery（A）32. According to the passage, anthropologists beli
36、eve that human beings _.A) have some traits in commonB) are born with diverse culturesC) are born without a fixed natureD) change their characters as they grow up（C）33. The author mentioned Aristotle, a great ancient thinker, in order to _.A) emphasize that he contributed a lot to defining the conce
37、pt of “human nature”B) show that the concept of “human nature” was used to justify social evilsC) prove that he had a profound influence on the concept of “human nature”D) support the idea that some human traits are acquired（D）34. The word “untenable” (Line 3) in the last paragraph of the passage mo
38、st probably means _.A) invaluableB) imaginableC) changeableD) indefensible（ D）35. Most philosophers believed that human nature _.A) is the quality distinguishing man from other animalsB) consists of competitiveness and selfishnessC) is something partly innate and partly acquiredD) consists of ration
39、ality and undesirable behaviorQuestions 36 to 40 are based on the following passage.Richard Satava, program manager for advanced medical technologies, has been a driving force in bringing virtual reality to medicine, where computers create a “virtual” or simulated environment for surgeons and other
40、medical practitioners (从业者).“With virtual reality well be able to put a surgeon in every trench,” said Satava. He envisaged a time when soldiers who are wounded fighting overseas are put in mobile surgical units equipped with computers.The computers would transmit images of the soldiers to surgeons
41、back in the U.S. The surgeons would look at the soldier through virtual reality helmets (头盔) that contain a small screen displaying the image of the wound. The doctors would guide robotic instruments in the battlefield mobile surgical unit that operate on the soldier.Although Satavas vision may be y
42、ears away from standard operating procedure, scientists are progressing toward virtual reality surgery. Engineers at an international organization in California are developing a tele-operating device. As surgeons watch a three-dimensional image of the surgery, they move instruments that are connecte
43、d to a computer, which passes their movements to robotic instruments that perform the surgery. The computer provides feedback to the surgeon on force, textures, and sound.These technological wonders may not yet be part of the community hospital setting but increasingly some of the machinery is findi
44、ng its way into civilian medicine. At Wayne State University Medical School, surgeon Lucia Zamorano takes images of the brain from computerized scans and uses a computer program to produce a 3-D image. She can then maneuver the 3-D image on the computer screen to map the shortest, least invasive sur
45、gical path to the tumor (肿瘤). Zamorano is also using technology that attaches a probe to surgical instruments so that she can track their positions. While cutting away a tumor deep in the brain, she watches the movement of her surgical tools in a computer graphics image of the patients brain taken b
46、efore surgery.During these proceduresoperations that are done through small cuts in the body in which a miniature camera and surgical tools are maneuveredsurgeons are wearing 3-D glasses for a better view. And they are commanding robot surgeons to cut away tissue more accurately than human surgeons
47、can.Satava says, “We are in the midst of a fundamental change in the field of medicine.”36. According to Richard Satava, the application of virtual reality to medicine _.A) will enable surgeons to be physically present on every battlefieldB) can raise the spirits of soldiers wounded on the battlefie
48、ldC) will greatly improve medical conditions on the battlefieldD) can shorten the time for operations on soldiers wounded on the battlefield（D）37. Richard Satava has visions of _.A) using a remote-control technique to treat wounded soldiers fighting overseasB) wounded soldiers being saved by doctors
49、 wearing virtual reality helmets on the battlefieldC) wounded soldiers being operated on by specially trained surgeonsD) setting up mobile surgical units overseas（A）38. How is virtual reality surgery performed?A) It is performed by a computer-designed high precision device.B) Surgeons wear virtual reality helmets to receive feedback provided by a computer.C) Surgeons move robotic instruments by means of a computer linked to them.D) A 3-D image records the movem
