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.
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