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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单项选择题
The road is laid ahead of him, a ______ gray line stretching to the horizon.
A．constant
B．repeated
C．continuous
D．wide
单项选择题
The question is still ______ discussion.
A．in
B．by
C．for
D．under
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