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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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
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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