单项选择题

Some would consider that an infringement of good manners whereas others would not.

A．an example
B．a violation
C．a problem
D．an indication
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单项选择题
Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.
A．determined
B．argued
C．pretended
D．hypothesized
单项选择题
Regional planning deals with proposals concerning outlying communities and highways as well as with urban affairs.
A．outlandish
B．exclusive
C．exempted
D．remote
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