单项选择题

A．It is very simple to operate.
B．It does not produce pollution.
C．It costs quite a bit of money to use.
D．It can replace cars in crowded city centers.
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单项选择题
A．ThreeB．Five.C．Seven.D．Fifteen.
A．Three
B．Five.
C．Seven.
D．Fifteen.
单项选择题
A．The man should join the student union.B．She agrees with the man.C．The man shouldn’t feel like that.D．She would join the union.
A．The man should join the student union.
B．She agrees with the man.
C．The man shouldn’t feel like that.
D．She would join the union.
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