单项选择题

While some bacteria are beneficial, others are harmful in that cause disease.

A．detrimental
B．prodigious
C．intrusive
D．mordant
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Don't try to dignify those few hairs on your face by calling them a beard.
A．make noble
B．talk of
C．cry out
D．single out
单项选择题
He was a little lightheaded since he just caught a cold.
A．trembling
B．tiresome
C．dizzy
D．timid
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