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 people's 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
C) are likely to induce the blockage of arteries
D) are advisable for those with vitamin deficiencies
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
Passage Two
Questions 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 rather 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 her 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 working 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 wife's 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 that 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 increase household income and relieve some of these pressing financial burdens. By raising a family's standard of living, a working wife may strengthen her family's financial and emotional stability.
Psychological factors also should be considered. For example, a wife blocked from a career outside the home may 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 women's inequality in marriage has been due to 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 file family. A working wife may rob a husband of being the master of the house. Depending upon how the couple reacts 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) defy
B) signal
C) suffer from
D) result from
27. It is said in the passage that when the economy slides,_____.
A) men would choose working women as their marriage partners
B) more women would get married to seek financial security
C) even working women would worry about their marriages
D) more people would prefer to remain single for the time bei
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