单项选择题

Because of its intimacy,radio is usually more that just a medium;it is_____.

A． firm
B． company
C．corporation
D． enterprise
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单项选择题
According to one belief,if truth is to be known it will make itself apparent, so one ______ wait instead of searching for it.
A． would rather
B． had to
C．cannot but
D．had best
单项选择题
The introduction of gunpowder gradually made the bow and arrow ______ , particularly in Western Europe.
A．obscure
B．obsolete
C．optional
D． overlapping
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