单项选择题

The person who______ this type of approach for doing research deserves our praise.

A．generated
B．originated
C．speculated
D．manufactured
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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
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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