现在很多考生的问题是复习方法本末倒置,花了大量的时间学习和研究考试形式,却忽视了提高阅读能力。
21. 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 peoples health
C) were too expensive for daily consumption
D) could not provide any cure for vitamin deficiencies
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
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
24. It can be seen that large doses of multivitamins _____.
A) may bring about serious side effects
B) may help prevent excessive bleeding
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