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
Radio is one of ______ means of sending news and information.
A．the most common
B．the commonest
C．more common
D．common
单项选择题
The mere fact ______ most people believe nuclear war would be mad does not mean that it will not occur.
A．that
B．which
C．what
D．whose
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