单项选择题

We should always keep in mind that ______ decisions often lead to bitter regrets.

A．hasty
B．instant
C．prompt
D．rapid
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单项选择题
The scientist has made quite a few discoveries, ______ of great importance to the whole world.
A．which I think they are
B．which I think are
C．I think which are
D．that I think they are
单项选择题
Hardly a month goes by without ______ of another survey revealing new depths of scientific illiteracy among US citizens.
A．words
B．word
C．a word
D．the word
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