No one knows why we sleep, but it’s certain that we need to. People who are prevented from sleeping begin to suffer obvious effects after a few days—they think less clearly, and they fall asleep during the working hours; some may have hallucinations(幻觉).
There are no rules about sleep. Generally speaking, grown-ups sleep about 7 and a half hours each night and probably more than 60 per cent get between seven and eight hours. But perhaps eight per cent are quite happy with 5 hours or less, and four per cent or so find that they want ten hours or more. If you feel all right, you’re probably getting enough sleep. The important thing is not to worry how much other people get—their needs may be different. Exercise doesn’t seem to increase the need for sleep—office workers, for example, sleep for about as long as people doing physically active work.
Children sleep more than grown-ups—perhaps 14 to 18 hours soon after birth, going down to grown-up levels by early teenage. Sleep patterns also tend(倾向) to be different in the elderly, who may sleep less at night than they did when younger, find sleep getting more broken, and often make it a rule to sleep during the daytime.
【小题1】According to the passage, some people are unable to think clearly because .A．they have hallucinationsB．they feel sleepy during the working hoursC．they don’t have enough sleepD．they are certain to be kept from going to bed【小题2】Which of the following is TRUE?A．All grown-ups must have at least eight-hour sleep.B．Most of grown-ups sleep for seven or eight hours.C．Quite a few people need only 5 hours or less for them to sleep.D．No grown-ups sleep more than ten hours.【小题3】Whether you have got enough sleep is judged by .A．how many hours you have sleptB．how many hours you need to sleepC．whether you do exercise and physical workD．whether you feel fresh and energetic【小题4】According to the passage, a boy of 14 years old sleeps .A．as long hours as a grown-upB．much longer hours than a grown-upC．for 14 hours each nightD．for less than 8 hours per nightC
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(答案→)C
解析：睡眠对我们是非常重要的，睡眠不足会带来很多的问题，文章就不同的年龄阶段的睡眠时间和模式进行说明。
【小题1】细节题：从文章第一段的句子：People who are prevented from sleeping begin to suffer obvious effects after a few days—they think less clearly, and they fall asleep during the working hours; some may have hallucinations(幻觉).可知一些人不能清楚的思考是因为没有足够的睡眠，选C
【小题2】细节题：从文章第二段的句子：There are no rules about sleep. Generally speaking, grown-ups sleep about 7 and a half hours each night and probably more than 60 per cent get between seven and eight hours.可知大部分成年人的睡眠是7到8小时，选B
【小题3】细节题：从文章第二段的句子：If you feel all right, you’re probably getting enough sleep.可知是否有足够的睡眠是通过是否恢复体力，精力充沛判断的，选D
【小题4】细节题：从文章第三段的句子：Children sleep more than grown-ups—perhaps 14 to 18 hours soon after birth, going down to grown-up levels by early teenage.可知一个14岁的男孩睡的时间和成年人一样长。选A