单项选择题

A．Air plane.
B．Bus.
C．Subway.
D．Car.
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单项选择题
A．It led to many other inventions.B．Man had no use for it then.C．There were no wheels in nature.D．All of the above.
A．It led to many other inventions.
B．Man had no use for it then.
C．There were no wheels in nature.
D．All of the above.
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