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
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单项选择题
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
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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