4．When you are having class in the early morning，it is not unusual to notice your classmate sitting beside you yawning．He （1）Dthat he didn't have a sound sleep the night before．Many（2）Bdon't get adequate sleep because they are burdened with too much homework，which keeps them up at night doing countless exercise．Some teens cannot（3）Cat night even when they want to so much．
Researches show that during your teenage years，the body's biological clock is（4）B，telling you to sleep later at night and wake up（5）Din the morning．But（6）Ain the body clock aren't the only reason teens lose sleep．Lots of people have insomnia（失眠）．The most common cause of insomnia is（7）C．But all sorts of things can lead to insomnia，including（8）Bdiscomfort，emotional troubles and even sleeping environment．It's common for everyone to have insomnia occasionally．But if it  （9）Dfor a month or more，go and consult a doctor．
Most teens have（10）Asometimes，which may make you sweat．But，if they are too frequent，a person's sleep pattern can be seriously（11）D．The most common cause of them is emotional（12）C，such as fear，stress or anxiety．If you have them a lot，you're also supposed to talk to a （13）A．
Medical specialists encourage teens to make lifestyle changes to help them develop good sleeping（14）B．Most probably you know that a cup of coffee can keep you （15）Cat night，but did you know that playing video games or watching TV does the same？
1．A．yellsB．provesC．claimsD．complains
2．A．a(chǎn)dultsB．teensC．parentsD．teachers
3．A．studyB．workC．sleepD．communicate
4．A．brokenB．resetC．repairedD．damaged
5．A．soonerB．earlierC．quickerD．later
6．A．changesB．movesC．patternsD．model
7．A．happinessB．joyC．stressD．homework
8．A．mentalB．physicalC．biologicalD．medical
9．A．helpsB．reportsC．stopsD．lasts
10．A．nightmaresB．dreamsC．stressD．change
11．A．improvedB．destroyedC．a(chǎn)dvancedD．a(chǎn)ffected
12．A．issueB．a(chǎn)ffairC．problemsD．things
13．A．doctorB．desk-mateC．teacherD．friend
14．A．ideaB．habitsC．timeD．environment
15．A．a(chǎn)sleepB．a(chǎn)liveC．a(chǎn)wakeD．a(chǎn)nnoyed．

分析 本文是一篇健康類的完型閱讀，主要講的是睡眠的重要性、目前青少年睡眠不足的現(xiàn)象及其背后的原因以及專家提出的一些建議．

解答 1-5．DBCBD 6-10．ACBDA 11-15．DCABC
第1題答案．D．他"抱怨"昨晚沒睡好，故本題答案為D選項．
第2題答案．B．很多的"年輕人（學(xué)生）"沒有得到足夠的睡眠，因為他們家庭作業(yè)的負(fù)擔(dān)太重；故本題答案為B選項．
第3題答案．C．即使想睡也睡不著，故本題答案為C選項．
第4題答案．B．研究者說青年時期的人體生物鐘被"重新設(shè)置"了，故本題答案為B選項．
第5題答案．D．生物鐘告訴你要"晚睡晚起"，故本題答案為D選項．
第6題答案．A．上文提到的生物鐘的"改變"，故本題答案為A選項．
第7題答案．C．"壓力"大是失眠最常見的原因，故本題答案為C選項．
第8題答案．B．從后面兩點：情緒上的和環(huán)境上的，可以推斷出這里是身體上的；故本題答案為B選項．
第9題答案．D．偶爾的失眠沒多大關(guān)系，但"持續(xù)"長時間的失眠就必須看醫(yī)生了；故本題答案為D選項．
第10題答案．A．根據(jù)下文講的"噩夢"可知本題答案為A選項．
第11題答案．D．一個人的睡眠模式會被嚴(yán)重"影響"，故本題答案為D選項．
第12題答案．C．由such as stress or anxiety可知本題答案為C選項"問題"．
第13題答案．A．有問題要與"醫(yī)生"交流，故本題答案為A選項．
第14題答案．B．養(yǎng)成良好的睡眠"習(xí)慣"，故本題答案為B選項．
第15題答案．C．咖啡提神，讓人興奮"不能入睡"，故本題答案為C選項．

點評 本文是一篇健康類的完形填空，題目涉及多道細(xì)節(jié)理解題，做題時結(jié)合原文和題目有針對 性找出相關(guān)語句進(jìn)行仔細(xì)分析，結(jié)合選項選出正確答案．推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案．

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