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1.Most people today think of sleep as one continuous period of downtime.This is not the way people used to sleep.According to researchers,in earlier times,people divided sleep by first sleeping a few hours,waking up,then going back to sleep.In the first period,you would typically sleep until midnight or shortly afterwards.Halfway through the night,you came out of first sleep,you would stay in bed and relax quietly.It was called the watching period.Then you would start to feel sleepy.so would return to bed and tall asleep again for your second sleep.This period would continue until early morning when daylight arrived.With no artificial lighting in homes,people naturally woke up early to take advantage of sunlight.
Before the 18th century,people had no gas or electricity in their homes.Fire,candles,or oil lamps were the common forms of lighting.This lack of artificial lighting in homes contributed to people's sleep patterns.It made sense for people to go to bed early.
Today,human may consider divided sleep a strange habit,but sleep researchers say that it is actually a more natural sleep pattern.Dr.Thomas Wehr of the U.S.National Institute of Mental Health has studied human sleep.He thinks that modern sleep problems occur because the older,natural way of sleep is breaking through the more recent continuous sleep pattern.Wehr and other scientists believe that artificial lighting has altered the way people sleep.In a research study,he asked 15adults to rest and sleep in darkness for 14hours(from 6:00P.M.to 8:00A.M.).At first,the subjects took a few hours to get to sleep,and then slept 11hours a night.Then overtime,they switched to divided sleep.They fell asleep for about three to five hours in the evening,stay awake for an hour or two,and then slept again for four hours till early morning.
We modern humans generally do not practice divided sleep.However,many of us have the experience of waking up in the middle of the night.We usually consider this a sleeping"problem".but perhaps we should look at it as natural behavior.Divided sleep may be the way we should all be sleeping.A first sleep followed by a relaxation period and a second period of sleep could help all of us to beat the stress of our fast-paced lives.

32.According to the first paragraph,we know the people in the pastB.
A.did not sleep as well as people today
B.divided their sleep into two parts
C.woke up and went out during the night
D.fell asleep easily because of hard work
33.In Paragraph 3,what does the research study suggest?C
A.Divided sleep is a strange way to sleep.
B.Divided sleep means sleeping 11hours in one period.
C.Divided sleep is a natural sleep pattern for humans.
D.Divided sleep occurs when people sleep with artificial lights.
34.Which of the following is NOT true according to the text?A
A.People had a divided sleep pattern only in the 18th century.
B.It may be natural to wake up in the middle of the night.
C.Scientists agree that artificial lighting has changed the way people sleep.
D.Some of the people today are not familiar with the practice of divided sleep.
35.What conclusion does the author make about divided sleep?D
A.It is one type of sleeping problems.
B.It is not the best sleep pattern for everyone.
C.It shouldn't be accepted by modern humans.
D.It could be helpful for people to handle daily stress.

分析 本文属于说明文阅读,作者通过这篇文章主要向我们描述了睡眠状态的改变历程,最早的时候,人们一睡睡几个小时,醒了,然后回去继续睡;后来,人工照明,改变了人们的睡眠方式,晚上三到五个小时的睡眠,保持清醒一个小时或两个小时,然后再睡四个小时,直到清晨;而现在,我们现代人一般不分时间的睡觉.

解答 32.B.细节理解题.根据第一段"According to researchers,in earlier times,people divided sleep by first sleeping a few hours,waking up,then going back to sleep."可知,过去人们睡觉分为两个阶段,即:先睡几个小时,醒来,然后再睡.故选B.
33.C.细节理解题.根据第三段描述的试验可知,接受试验的人们,最初要花几个小时才能睡着,然后一觉到天亮;后来,他们自然地把睡眠分为两个阶段,与先前的人们一样了.所以我们可知,人类把睡眠分为两个阶段是一种自然状态.故选C.
34.A.推理判断题.根据第三段"Today,human may consider divided sleep a strange habit,but sleep researchers say that it is actually a more natural sleep pattern."可知,人们有分开的睡眠模式是自然状态,只是环境改变了这一切.所以说只在18世纪人们才有分开的睡眠模式是不对的. 故选A.
35.D.细节理解题.根据最后一段"Divided sleep may be the way we should all be sleeping.A first sleep followed by a relaxation period and a second period of sleep could help all of us to beat the stress of our fast-paced lives."可知,第二阶段睡眠可以帮助我们减少快节奏生活带来的压力.故选D.

点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.

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