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
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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
单项选择题
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
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