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17.Who knows about sleep?Astronauts.They have to.Their bodies are cut off from the outside world that reminds us what time it is.But actually,it's even worse than that.An astronaut reported  in his diary that he was likely to  make mistakes on days following an unusually late bedtime.
So NASA started doing some serious research.They quickly realized that we're a slave to the outside world.Without light and darkness,we're unable to regulate (管理) sleep times.
Because of modern technology,we're all living more like astronauts now.Light is no longer a function of the sun,but of always-on indoor lights,TV and computer screens.Temperature no longer follows a cycle of cooling at night and warming during the day.Is it any wonder that a third of American have sleep problems?
Maybe you think this doesn't affect you---or at least not much.You're wrong.Research done on non-astronauts has shown the same thing.After two weeks of six hours of sleep a night,you're drunk.By the end of two weeks,the six-hour sleepers behaved as badly as those who hadn't slept for 24hours.
But what did they say when asked how they felt?"It's not affecting me."So if you are performing poorly because of sleep problems,you may have no idea.This is a real problem.
So what answers did NASA come up with?
Take an hour to calm down before bed.Yes,you're busy.But your time is not more valuable than an astronauts'.
Keep your bedroom dark,cool and free from noise.Even if you think"the light doesn't affect you"or"the noise isn't that bad",it can still affect sleep quality.
Another advice:forget the alarm clock in the morning; set an alarm to remind you to go to bed at night.When it goes off,finish up any work on the computer,and turn off any unnecessary lights.This prevents you from cheating yourself on sleep and allows you to wake up naturally.

29.What did NASA find about people's sleep?B
A.It takes a long time to develop regular sleep times.
B.It's strongly influenced by the outside world.
C.It remains untouched by outside influences.
D.It's hard to change one's sleep habits.
30.Paragraph 3is mainly aboutC.
A.different sleep types
B.the importance of a good sleep
C.the reasons why we have sleep problems
D.the disadvantages of modern technology
31.The biggest problem of those who haven't enough sleep lies in the fact thatB.
A.they can't fall asleep without the lights on
B.they don't know whether they sleep well
C.they refuse to regulate their sleep times
D.they get too drunk to sleep well.
32.What's the advice on the alarm clock?A
A.Use it to remind you it sleep.
B.Put it far away from your bed.
C.Get up immediately when it rings.
D.Listen carefully to it when it rings.

分析 本文主要讲了人们的睡眠问题.因为现代技术,光和温度等都不再依照自然规律,这造成了人们的睡眠问题.长期缺少睡眠使人们在日常生活中表现不好,作者建议定闹钟来提醒你睡觉.

解答 29.B 推理判断题.根据第二段中的"They quickly realized that we're a slave to the outside world.Without light and darkness,we're unable to regulate (管理) sleep times."可知,外界环境对人们有很大的影响,故选B.
30.C 段落大意题.第三段讲述了因为现代技术,光和温度等都不再依照自然规律,这造成了人们的睡眠问题,故选C.
31.B 推理判断题.根据第四段及 第五段内容可知,长期缺少睡眠使人们在日常生活中表现不好,但是自己却意识不到,这是最大的问题,故选B.
32.A 细节理解题.根据最后一段中的"set an alarm to remind you to go to bed at night"可知,作者建议定闹钟来提醒你睡觉,故选A.

点评 阅读理解题测试考生在阅读基础上的逻辑推理能力,要求考生根据文章所述事件的逻辑关系,对未说明的趋势或结局作出合理的推断;或根据作者所阐述的观点理论,对文章未涉及的现象、事例给以解释.考生首先要仔细阅读短文,完整了解信息,准确把握作者观点.

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