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
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
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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