单项选择题

A．Manners young people should have.
B．Good deeds of the young.
C．Bad behavior in the society.
D．Rude manners of young people on buses.
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单项选择题
A．Because it is designed like a cradle.B．Because it is pulled and pushed by magnetic attraction and repulsion.C．Because it runs on air.D．Because there’s no friction between wheels and rails.
A．Because it is designed like a cradle.
B．Because it is pulled and pushed by magnetic attraction and repulsion.
C．Because it runs on air.
D．Because there’s no friction between wheels and rails.
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