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

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单项选择题
The wheel is called （）

A．simple
B．complicated
C．strange
D．unusual
单项选择题
The wheel is important because（）

A．it was man' s first real invention
B．all transportation depends on it
C．every machine depends on it
D．both B and C
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