单项选择题

I think I managed to grasp the main points of the lecture.

A．cover
B．understand
C．prove
D．discuss
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单项选择题
A．associateB．carryC．spreadD．withdraw
A．associate
B．carry
C．spread
D．withdraw
单项选择题
The placebo works more effectively than the vitamins in reducing the risk of low birth weight.
A．Right
B．Wrong
C．Not mentioned
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