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1、Unit1AlandofdiversityⅠ.阅读理解A(2017·浙江)GettinglesssleephasbecomeabadhabitformostAmericankids.Accordingtoanewsurvey(调查)bytheNationalSleepFoundation,51%ofkidsaged10to18gotobedat10pmorlateronschoolnights,eventhoughtheyhavetogetupearly.LastyeartheFoundationreportedthat
2、nearly60%of7-to12-year-oldssaidtheyfelttiredduringtheday,and15%saidtheyhadfallenasleepatschool.Howmuchsleepyouneeddependsalotonyourage.Babiesneedalotofrest:mostofthemsleepabout18hoursaday!Adultsneedabouteighthours.Formostschool-agechildren,tenhoursisideal(理想的).Bu
3、tthenewNationalSleepFoundationsurveyfoundthat35%of10-to12-year-oldsgetonlysevenoreighthours.Andguesswhatalmosthalfofthesurveyedkidssaidtheydobeforebedtime?WatchTV.“MorechildrenaregoingtobedwithTVson,andtherearemoreopportunities(机会)tostayawake,withmorehomework,the
4、Internetandthephone,”saysDr.MaryCarskadon,asleepresearcheratBrownUniversityMedicalSchool.Shesaystheseactivitiesatbedtimecangetkidsallexcitedandmakeithardforthemtocalmdownandsleep.Otherexpertssaypartoftheproblemischemical.Changinglevelsofbodychemicalscalledhormone
5、snotonlymaketeenagers’bodiesdevelopadultcharacteristics,butalsomakeithardforteenagerstofallasleepbefore11pm.Becausesleepinessissuchaproblemforteenagers,someschooldistrictshavedecidedtostarthighschoolclasseslaterthantheyusedto.Threeyearsago,schoolsinEdina,Minnesot
6、a,changedthestarttimefrom7:25amto8:30am.Students,parentsandteachersarepleasedwiththeresults.【语篇导读】研究表明,大部分美国孩子已经形成了不良的睡眠习惯。他们入睡晚,睡眠不足。其原因是电视、手机、网络、作业等一些令他们兴奋的事情影响了他们,导致身体内激素水平的变化,进而使得他们入睡晚。对此,学校也采取了改变上学时间等措施来解决此类问题。1.WhatisthenewNationalSleepFoundationsurveyon?A.
7、Americankids’sleepinghabits.B.Teenagers’sleep-relateddiseases.C.Activitiestopreventsleeplessness.D.Learningproblemsandlackofsleep.答案A解析细节理解题。根据后文的介绍可知,美国“全国睡眠基金会”的调查针对的是美国10至18岁少年睡眠时间不足的情况及其影响,而不是疾病、失眠或学习问题。故选A项。2.Howmanyhoursofsleepdo11-year-oldsneedeveryday?
8、 A.7hours.B.8hours.C.10hours.D.18hours.答案C解析细节理解题。根据第二段中的“Formostschool-agechildren,tenhoursisideal.”可知,对于11岁的孩子来说,每天10小时的睡眠时间是最理想的,故C项正确。3.Whydoteenage
