单项选择题

A．A speed limit.
B．A speed -cheek,
C．A distance measurement.
D．A traffic-sign.
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单项选择题
A．There are more people who use cars now than before.B．More people use bikes for physical fitness.C．More children are getting on using bikes.D．Air pollution is a national problem.
A．There are more people who use cars now than before.
B．More people use bikes for physical fitness.
C．More children are getting on using bikes.
D．Air pollution is a national problem.
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