单项选择题

The doctor warned him to ______ his workload if he wanted to maintain health.

A．ward off
B．put away
C．cut down
D．stand for
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单项选择题
In the past, energy sources were thought to be ______, but it was not the case.
A．productive
B．transient
C．eternal
D．boundless
单项选择题
The passengers on the plane have been held ______ for ten hours before the police had a firm control over the hijackers.
A．captive
B．capsule
C．cavity
D．casualty
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