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
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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
单项选择题
I ______ the disdainful look in his eyes.
A．grumbled
B．resented
C．complained
D．dissatisfied
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