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
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单项选择题
This selection says that the first wheel may have been a ______ .
A．round piece of stone
B．heavy log
C．piece of metal
D．slice of log
单项选择题
The wheel is called ______ .
A．simple
B．complicated
C．strange
D．unusual
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