单项选择题

They took______ measures to prevent poisonous gases from escaping.

A．fruitful
B．beneficial
C．sufficient
D．effective
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单项选择题
He gave her some beautiful roses ______her kindness.
A．in control of
B．in place of
C．in return for
D．in the name of
单项选择题
______is often more difficult to find trained men than to get financial support for scientific research.
A．It
B．That
C．This
D．What
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