单项选择题

Bicycles make the air ______.

A．clean
B．dirty
C．noisy
D．fresh
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单项选择题
Bike for a Better City members ______.
A．ride bicycles to play
B．drive all the cars away from the city
C．buy so many bikes
D．ride bicycle to work
单项选择题
Taxi drivers like ______ traffic.
A．slow
B．slower
C．fast
D．comfortable
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