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
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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
单项选择题
Although a teenager, Fred could resist______ what to do and what not to do.
A．being told
B．telling
C．to be told
D．to tell
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