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A Letter to the Editor of a Campus ......

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单项选择题
Sleep defensively means that people should ______.
A．go to see a doctor when they have sleep problems
B．keep to a flexible sleep pattern
C．sacrifice other things to get enough sleep if necessary
D．follow changeable sleep routines
单项选择题
According to the author, many sleeping disorders are caused by ______.
A．bad eating habits
B．pre-bedtime exercises
C．improper sleep patterns
D．chronic fatigue syndrome
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