单项选择题

A．One year
B．Two years
C．Three years
D．Four years
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单项选择题
A．They get more cold and flu symptoms.B．They sleep more.C．They smoke and drink more.D．They have more digestive problems.
A．They get more cold and flu symptoms.
B．They sleep more.
C．They smoke and drink more.
D．They have more digestive problems.
单项选择题
A．20,000B．26,000C．30,000D．36,000
A．20,000
B．26,000
C．30,000
D．36,000
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