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.
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单项选择题
A．In the street.B．In a family swimming pool.C．In a public swimming pool.D．In a kindergarten.
A．In the street.
B．In a family swimming pool.
C．In a public swimming pool.
D．In a kindergarten.
单项选择题
A．Right now.B．This evening.C．This afternoon.D．Tomorrow morning.
A．Right now.
B．This evening.
C．This afternoon.
D．Tomorrow morning.
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