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单选题
A
Rest frequently during the day.
B
Lack of sleep on weekends.
C
Lack of exercise in the evening.
D
Eating cheese before going to bed.
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参考解析
解析：
[考点]细节题。会导致睡眠问题有几个方面，像一天之内频繁地休息，不锻炼或者晚上大量锻炼，周末睡得很多还很晚。
[考点]细节题。会导致睡眠问题有几个方面，像一天之内频繁地休息，不锻炼或者晚上大量锻炼，周末睡得很多还很晚。
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