单项选择题

The human ear admits only a very limited range of frequencies.

A．confesses
B．gives off
C．forces in
D．lets in
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单项选择题
The product appeared to be adequate in every respect.
A．improper
B．sufficient
C．superior
D．poor
单项选择题
A conscientious teacher spends hours preparing for classes and correcting students' paper.
A．creative
B．leading
C．skillful
D．careful
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