单项选择题

It was remarkable of man to invent the wheel because （）

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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单项选择题
The wheel was probably invented by （）

A．a group of early hunters
B．the first men on earth
C．a great prehistoric thinker
D．the man who made the first cart
单项选择题
The wheel is called （）

A．simple
B．complicated
C．strange
D．unusual
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