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(幻覺).?
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(傾向) 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.
【小題1】According to the passage, some people are unable to think clearly because ___________ .

A．they have hallucinations
B．they feel sleepy during the working hours
C．they don’t have enough sleep
D．they are certain to be kept from going to bed
【小題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.
【小題3】Whether you have got enough sleep is judged by__________.
A．how many hours you have slept
B．how many hours you need to sleep
C．whether you do exercise and physical work
D．whether you feel fresh and energetic
【小題4】According to the passage, a boy of 14 years old sleeps__________.
A．a(chǎn)s long hours as a grown-up
B．much longer hours than a grown-up
C．for 14 hours each night
D．for less than 8 hours per night


【小題1】C
【小題2】B
【小題3】D
【小題4】A 

解析試題分析：睡眠對(duì)我們是非常重要的，睡眠不足會(huì)帶來很多的問題，文章就不同的年齡階段的睡眠時(shí)間和模式進(jìn)行說明。
【小題1】細(xì)節(jié)題：從文章第一段的句子：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(幻覺).?可知一些人不能清楚的思考是因?yàn)闆]有足夠的睡眠，選C
【小題2】細(xì)節(jié)題：從文章第二段的句子：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小時(shí)，選B
【小題3】細(xì)節(jié)題：從文章第二段的句子：If you feel all right, you’re probably getting enough sleep.可知是否有足夠的睡眠是通過是否恢復(fù)體力，精力充沛判斷的，選D
【小題4】細(xì)節(jié)題：從文章第三段的句子：Children sleep more than grown-ups—perhaps 14 to 18 hours soon after birth, going down to grown-up levels by early teenage.可知一個(gè)14歲的男孩睡的時(shí)間和成年人一樣長。選A  
考點(diǎn)：考查日常生活類短文

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Thank you for trusting me. I enjoy exchanging my ideas with yours
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