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.
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单项选择题
A．It would be normal if the car took just four seconds.B．It would be normal if the car took six seconds.C．It would be normal if the car took less than three seconds,D．It would be normal if the car took less than six minutes,
A．It would be normal if the car took just four seconds.
B．It would be normal if the car took six seconds.
C．It would be normal if the car took less than three seconds,
D．It would be normal if the car took less than six minutes,
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