单项选择题

A．It is not at all dangerous if one is careful.
B．It won’t cost much to buy a bike.
C．It does them a lot of good.
D．It is interesting.
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单项选择题
A．Because they want to keep fit.B．Because they want to look pleasant.C．Because they are misled by doctors.D．Both A and B.
A．Because they want to keep fit.
B．Because they want to look pleasant.
C．Because they are misled by doctors.
D．Both A and B.
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