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  3. In 99 cases out of 100, insomnia (失眠) is caused by a disturbance of the natural sleep rhythm. The reasons why the rhythm has bee

In 99 cases out of 100, insomnia (失眠) is caused by a disturbance of the natural sleep rhythm. The reasons why the rhythm has bee

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问题     In 99 cases out of 100, insomnia (失眠) is caused by a disturbance of the natural sleep rhythm. The reasons why the rhythm has been disturbed are many and they range from drugs that are being taken to treat a separate medical condition to anxiety. A sudden change in lifestyle or climate could do it, or just that you’ve fallen into the habit of dozing off(瞌睡) in front of the television.
    Certainly the body must have enough sleep. Tests that deprived people of sleep have proved lack of it can cause fairly rapid physical and mental deterioration (恶化). But on the other hand, it doesn’t need too much. So if you’re sleeping in front of the TV, you won’t sleep soundly at night. Similarly, if you’re holidaying in Spain, and spending your days sleeping on the beach, chances are that you’ll be wide awake at bedtime.
    Of course, the problem for my summer insomniacs is that, despite almost overwhelming urge to put their heads down on their desks in the afternoons, they aren’t getting any extra sleep to compensate for their wakeful nights. For the worst sufferers, I sometimes prescribe(开 药方) a mild sleeping pill which, after a few nights, reestablishes the body’s natural sleep rhythm, conditioning it to accept the heat.
Lack of sleep will lead to ________.
选项 A、a sudden change in lifestyle
B、a good condition in body
C、the habit of sleeping in front of the television
D、a quick drop in both body and mind condition
答案D
解析 细节题。第二自然段第二句lack of it can cause fairly rapid physical and mental deterioration也就是a drop in both body and mind condition。
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