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
A．in a wordB．in the meantimeC．in other wordsD．in that case
A．in a word
B．in the meantime
C．in other words
D．in that case
单项选择题
Careful surveys have indicated that as many as 50 percent of patients do not take drugs______ directed.
A．like
B．so
C．which
D．as
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