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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.adultsB.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.advancedD.affected
12.A.issueB.affairC.problemsD.things
13.A.doctorB.desk-mateC.teacherD.friend
14.A.ideaB.habitsC.timeD.environment
15.A.asleepB.aliveC.awakeD.annoyed.

分析 本文是一篇健康类的完型阅读,主要讲的是睡眠的重要性、目前青少年睡眠不足的现象及其背后的原因以及专家提出的一些建议.

解答 1-5.DBCBD 6-10.ACBDA 11-15.DCABC
第1题答案.D.他"抱怨"昨晚没睡好,故本题答案为D选项.
第2题答案.B.很多的"年轻人(学生)"没有得到足够的睡眠,因为他们家庭作业的负担太重;故本题答案为B选项.
第3题答案.C.即使想睡也睡不着,故本题答案为C选项.
第4题答案.B.研究者说青年时期的人体生物钟被"重新设置"了,故本题答案为B选项.
第5题答案.D.生物钟告诉你要"晚睡晚起",故本题答案为D选项.
第6题答案.A.上文提到的生物钟的"改变",故本题答案为A选项.
第7题答案.C."压力"大是失眠最常见的原因,故本题答案为C选项.
第8题答案.B.从后面两点:情绪上的和环境上的,可以推断出这里是身体上的;故本题答案为B选项.
第9题答案.D.偶尔的失眠没多大关系,但"持续"长时间的失眠就必须看医生了;故本题答案为D选项.
第10题答案.A.根据下文讲的"噩梦"可知本题答案为A选项.
第11题答案.D.一个人的睡眠模式会被严重"影响",故本题答案为D选项.
第12题答案.C.由such as stress or anxiety可知本题答案为C选项"问题".
第13题答案.A.有问题要与"医生"交流,故本题答案为A选项.
第14题答案.B.养成良好的睡眠"习惯",故本题答案为B选项.
第15题答案.C.咖啡提神,让人兴奋"不能入睡",故本题答案为C选项.

点评 本文是一篇健康类的完形填空,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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