单项选择题

A．Swim in public pools.
B．Give blood.
C．Over exert yourself.
D．Expose your skin to the sun.
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单项选择题
A．Customer and estate agent’.B．Customer and travel agent.C．Customer and shop assistant.D．Customer and lawyer.
A．Customer and estate agent’.
B．Customer and travel agent.
C．Customer and shop assistant.
D．Customer and lawyer.
填空题
theories
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