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
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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
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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