单项选择题

A．From chasing an animal.
B．From rolling a body of a heavy animal on logs.
C．From watching a rolling stone.
D．From watching running animals.
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单项选择题
A．A round piece of stone.B．A heavy log.C．Two slices of log connected at their centers by a strong stick.D．A piece of metal.
A．A round piece of stone.
B．A heavy log.
C．Two slices of log connected at their centers by a strong stick.
D．A piece of metal.
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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