单项选择题

The American population is composed of people of different ______ backgrounds.

A．aesthetic
B．ethnic
C．athletic
D．ethic
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单项选择题
Your employer will ______ income tax from your salary.
A．reconcile
B．reclaim
C．deduct
D．distract
单项选择题
The laughter at his joke is never forced, but always ______.
A．homogeneous
B．simultaneous
C．spontaneous
D．instinctive
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