单项选择题

A scientific law is liable at any time to need modifying. This happens when a fact is discovered which seems to ______ what the law would lead one to expect.

A．prove
B．support
C．contradict
D．discourage
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单项选择题
I've worked with him now over the course of four years, I know him ______.
A．here and there
B．back and forth
C．backwards and forwards
D．now and then
单项选择题
When there are not enough volunteers for the armed forces, the government ______ additional men.
A．revises
B．encourages
C．suspends
D．conscripts
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