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单项选择题
A．Failure to rest during the day.B．Lack of sleep on weekends.C．Vigorous exercise in the evenin
A．Failure to rest during the day.
B．Lack of sleep on weekends.
C．Vigorous exercise in the evenin
单项选择题
A．Your heart rate is lowered.B．It becomes harder to relax.C．You become too tired to sleep.
A．Your heart rate is lowered.
B．It becomes harder to relax.
C．You become too tired to sleep.
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