单项选择题

Costs for regulation of business actually are a hidden tax severely reducing the competitive ness of domestic businesses ______ when they face an increasingly global marketplace.

A．on occasions
B．at a time
C．under the circumstances
D．at once
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单项选择题
It is a general belief in American society that Asian or Asian-American parents are able to instill into their children a much greater incentive to work.
A．encouragement
B．motivation
C．inducement
D．inspiration
单项选择题
Our visual perception depends on the reception of energy reflecting or radiating from ______ which we wish to perceive.
A．it
B．these
C．that
D．those
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