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16.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 7and a half hours each night and probably more than 60per cent get between seven and eight hours.But perhaps eight per cent are quite happy with 5hours 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 14to 18hours 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.

67.According to the passage,some people are unable to think clearly becauseC.
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
68.Which of the following is TRUE?B
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 5hours or less for them to sleep.
D.No grown-ups sleep more than ten hours.
69.Whether you have got enough sleep is judged byD.
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
70.According to the passage,a boy of 14years old sleepsA.
A.as long hours as a grown-up
B.much longer hours than a grown-up
C.for 14hours each night
D.for less than 8hours per night.

分析 本文是一篇科教类阅读,主要讲了睡眠的重要性以及不同的人对于睡眠时间的需求是不同的.

解答 67-70 CBDA
67题答案:C考查细节推理,根据第一段的People who are prevented from sleeping begin to suffer obvious effects after a few days-they think less clearly…(没能休息的人几天后开始遭受一些明显的影响--他们思考不清晰…)可知本题答案为C选项.
68题答案:B考查细节推理,根据第二段的Generally speaking,grown-ups sleep about 7and a half hours each night and probably more than 60per cent get between seven and eight hours.(总的来数,成年人睡眠时间大约为每晚7.5小时而且还有可能超过60%的人睡眠在7-8个小时之间).可知本题答案为B选项.
69题答案:D考查细节推理,根据第一段的they think less clearly,and they fall asleep during the working hours; some may have hallucinations(幻觉).
(他们思考不清晰、工作时间睡觉、有些人甚至产生幻觉)可知这都是睡眠不足的影响,因此我们可以根据一个人是否感觉新鲜(思维清晰)和活跃来判断他是否得到足够的睡眠;故本题答案为D选项.
70题答案:A考查细节推理,根据最后一段的Children sleep more than grown-ups-perhaps 14to 18hours soon after birth,going down to grown-up levels by early teenage.出生后孩子的睡眠时间要长于成人--长达14-18个小时,等到他们青年早期(13-15岁左右)时睡眠时间降到了成人水平.故本题答案为A选项.

点评 本文是一篇科教类阅读,题目涉及多道细节理解题,做题时结合原文和题目有针对 性找出相关语句进行仔细分析,结合选项选出正确答案.推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案.

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