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单项选择题
A．swim in public pools.B．give blood.C．over exert yourself.D．expose your skin to the sun.
A．swim in public pools.
B．give blood.
C．over exert yourself.
D．expose your skin to the sun.
单项选择题
A．shortage of days.B．superstition.C．inability to divide the year.D．too many months.
A．shortage of days.
B．superstition.
C．inability to divide the year.
D．too many months.
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