单项选择题

A．smoke
B．fire
C．plant
D．clothing
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单项选择题
A．Three thousand years ago.B．When man began to salt fish.C．When man began to preserve the dead.D．No one knows.
A．Three thousand years ago.
B．When man began to salt fish.
C．When man began to preserve the dead.
D．No one knows.
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