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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单项选择题
Some would consider such speech an infringement of good mariners whereas others would not.
A．an example
B．a violation
C．an insult
D．an indication
单项选择题
Mass transportation revised the social and economic, fabric of the American city in many ways so as to permit an easy row of traffic.
A．texture
B．textile
C．network
D．structure
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