单项选择题

A．Failure to rest during the day.
B．Lack of sleep on weekends.
C．Vigorous exercise in the evening.
D．Eating cheese before going to bed.
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单项选择题
A．Growth of violence on TV.B．Decreasing of moral standards.C．Destructive threat from nuclear explosives.D．All of the above.
A．Growth of violence on TV.
B．Decreasing of moral standards.
C．Destructive threat from nuclear explosives.
D．All of the above.
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