单项选择题

We cannot always ______ natural rainfalls. We should take some effective measures to fight drought.

A．hang on
B．hold on
C．count on
D．come on
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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
Every society has its own peculiar customs and ______ of acting.
A．ways
B．behavior
C．attitudes
D．means
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