单项选择题

The waste pipe is blocked; try ______ it out with hot water.

A．rushing
B．brushing
C．crushing
D．flushing
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单项选择题
The wild animals are ______ in small cages in the zoo.
A．limited
B．bounded
C．restrict
D．confined
单项选择题
He ______ satisfaction from helping people in trouble.
A．derides
B．derives
C．deviates
D．detaches
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