英语六级阅读真题训练
导读：我根据大家的需要整理了一份关于《英语六级阅读真题训练》的内容，具体内容：英语六级考试中的阅读题是考试中的重点题型，需要考生多做阅读练习提高阅读能力，下面我为大家带来，供各位考生模拟练习。原文 For years, doctors advise...
英语六级考试中的阅读题是考试中的重点题型，需要考生多做阅读练习提高阅读能力，下面我为大家带来，供各位考生模拟练习。
原文
For years, doctors advised their patients that the only thing taking multivitamins does is givethem extensive urine (尿). After all, true vitamin deficiencies are practically unheard of inindustrialized countries. Now it seems those doctors may have been wrong. The results of agrowing number of studies suggest that even a modest vitamin shortfall can be harmful toyour health. Although proof of the benefits of multivitamins is still far from certain, the fewdollars you spend on them is probably a good investment.
Or at least thats the argument put forward in the New England Journal of Medicine. Ideally, sayDr. Walter Willett and Dr. Meir Stampfer of Harvard, all vitamin supplements would beevaluated in scientifically rigorous clinical trials.
But those studies can take a long time and often raise more
questions than they answer. Atsome point, while researchers work on figuring out where the truth lies, it just makes sense tosay the potential benefit outweighs the cost.
The best evidence to date concerns folate, one of the B vitamins. Its 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 doesnt seem tohelp. It may turn out that vitamin E plays a role in prevention but cannot undo seriousdamage.
Despite vitamin Cs 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 theres enough evidence that theydont hurt and could help?
If the latter, theres 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.
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 peoples 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) its risky to take multivitamins without knowing their specific function
C) the potential benefit of multivitamins can never be overestimated
D) its reasonable to take a rational dose of multivitamins daily
答案
21. A 22. B 23. C 24. A 25. D