单项选择题

The passage is mainly about

A．the harmful effect of vitamin A.
B．vitamin A and fractures.
C．vitamin A and human health.
D．vitamin A deficiency.
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单项选择题
We can learn from the text that
A．a man taking large amounts of vitamin A will suffer hip fractures.
B．the maximum of vitamin A a man takes every day should be within 3,000 IU.
C．the more a man consumes vitamin A every day, the higher chance he suffers hip fracture.
D．the less a man consumes vitamin A every day, the higher chance he stands of good health.
单项选择题
The word bolsters (Line 1, Paragraph 2) most probably means
A．hinders.
B．negates.
C．supports.
D．switches.
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