单项选择题

In human history, people's views on body weight______.

A．were closely related to their religious beliefs
B．changed from time to time
C．varied between the poor and the rich
D．led to different moral standards
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单项选择题
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
单项选择题
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
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