单项选择题

Very few scientists ______ completely new answers to the world's problems.

A．come up with
B．come out
C．come round
D．come up to
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单项选择题
A body, ______ it is in motion, would never stop itself if there were no friction.
A．where
B．by time
C．once
D．at the moment
单项选择题
The republication of the poet's most recent works will certainly ______ his national reputation.
A．magnify
B．strengthen
C．enlarge
D．enhance
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