单项选择题

The article suggests that when a person______ under unusual stress he should be especially careful to have a well-balanced diet.

A．is
B．were
C．be
D．was
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单项选择题
The 1986 Challenger space shuttle ______ was caused by unusually low temperatures immediacy before the launch.
A．dismay
B．disaster
C．expedition
D．controversy
单项选择题
How much of your country's electrical supply is ______from water power
A．deduced
B．derived
C．detached
D．declined
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