英語六級閱讀真題訓練原文

　　The best evidence to date concerns folate, one of the B vitamins. It’s been proved to limit thenumber of defects in embryos (胚胎), and a recent trial found that folate in combination withvitamin 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 unitsdaily for at least two years appear somewhat less likely to develop heart disease. But whendoctors give vitamin E to patients who already have he art disease, the vitamin doesn’t seem tohelp. It may turn out that vitamin E plays a role in prevention but cannot undo seriousdamage.

　　Despite vitamin C’s great popularity, consuming large amounts of it still has not beenpositively linked to any great benefit. The body quickly becomes saturated with C and simplyexcretes (排泄) any excess.

　　The multivitamins question boils down to this: Do you need to wait until all the evidence is inbefore you take them, or are you willing to accept that there’s enough evidence that theydon’t hurt and could help?

　　If the latter, there’s no need to go to extremes and buy the biggest horse pills or the mostexpensive bottles. Large doses can cause trouble, including excessive bleeding and nervoussystem 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 furtherrefinement, taking a daily multivitamin makes a lot of sense.

　　英語六級閱讀真題訓練

　　21. At one time doctors discouraged taking multivitamins because they believed thatmultivitamins ________.

　　A) could not easily be absorbed by the human body

　　B) were potentially harmful to people’s health

　　C) were too expensive for daily consumption

　　D) could not provide any cure for vitamin deficiencies(A)

　　22. According to the author, clinical trials of vitamin supplements ________.

　　A) often result in misleading conclusions

　　B) take time and will not produce conclusive results

　　C) should be conducted by scientists on a larger scale

　　D) 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 persistently

　　B) can effectively reduce the recurrence of heart disease

　　C) has a preventive but not curative effect on heart disease

　　D) 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 effects

　　B) may help prevent excessive bleeding

　　C) are likely to induce the blockage of arteries

　　D) are advisable for those with vitamin 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 diet

　　B) it’s risky to take multivitamins without knowing their specific function

　　C) the potential benefit of multivitamins can never be overestimated

　　D) it’s reasonable to take a rational dose of multivitamins daily

　　英語六級閱讀真題訓練答案

　　21. A 22. B 23. C 24. A 25. D