Questionsare based on the following passage.　　For years, doctors advis-考呗网

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单选题Questionsare 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 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 that’s the argument 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 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. It’s been proved to limit the number of defects in embryos （胚胎）, and a recent trial found that 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 when doctors give vitamin E to patients who already have he art disease, the vitamin doesn’t seem to help. It may turn out that vitamin E plays a role in prevention but cannot undo serious damage.
　　Despite vitamin C’s great popularity, consuming large amounts of it still has not been positively linked 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 there’s enough evidence that they don’t hurt and could help?
　　If the latter, there’s 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 understand that any potential benefit is modest and subject to further refinement, taking a daily multivitamin makes a lot of sense.
At one time doctors discouraged taking multivitamins because they believed that multivitamins ________.
A．could not easily be absorbed by the human body
B．were potentially harmful to people’s health &nbs

参考答案：A进入在线模考

本题为事实推断题。依据首段第一句话就可推断出以前的医生对服用复合维生素不以为然，因为他们认为维生素不能被人体吸收—从小便中排出体外。所以A为正确选项。

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1In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1.
For questions , mark
Y （for YES） if the statement agrees with the information given in the passage;
N （for NO） if statement contradicts the information given in the passage;
NG （for NOT GIVEN） if the information is not given in the passage.
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2Mary Lyn Miller’s job is to advise people on their life and career.

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3Mary Lyn Miller herself was once quite dissatisfied with her own work.

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