历年英语真题答案及解析.doc

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1、2008年12月CET6真题PartIwriting(30minutes)HowtoImproveStudents’MentalHealth?1.大学生的心理健康十分重要2.为此，学校可以……3.我们自己应该…… PartIIReadingComprehension(Skimmingandscanning)(15minutes)SupersizesurpriseAskanyonewhythereisanobesityepidemicandtheywilltellyouthatit’salldowntoeatingtoomuchandbu

2、rningtoofewcalories.Thatexplanationappealstocommonsenseandhasdominatedeffortstogettotherootoftheobesityepidemicandreverseit.Yetobesityresearchersareincreasinglydissatisfiedwithit.Manynowbelievethatsomethingelsemusthavechangedinourenvironmenttoprecipitate(促成)suchdramaticr

3、isesinobesityoverthepast40yearsorso.Nobodyissayingthatthe“bigtwo”–reducedphysicalactivityandincreasedavailabilityoffood–arenotimportantcontributorstotheepidemic,buttheycannotexplainitall.Earlierthisyearareviewpaperby20obesityexpertssetoutthe7mostplausiblealternativeexpla

4、nationsfortheepidemic.Heretheyare.1.  NotenoughsleepItiswidelybelievedthatsleepisforthebrain,notthebody.Couldashortageofshut-eyealsobehelpingtomakeusfat?Severallarge-scalestudiessuggesttheremaybealink.Peoplewhosleeplessthan7hoursanighttendtohaveahigherbodymassindexthanpe

5、oplewhosleepmore,accordingtodatagatheredbytheUSNationalHealthandNutritionExaminationSurvey.Similarly,theUSNurses’HealthStudy,whichtracked68,000womenfor16years,foundthatthosewhosleptanaverageof5hoursanightgainedmoreweightduringthestudyperiodthanwomenwhoslept6hours,whointu

6、rngainedmorethanwhosewhoslept7.It’swellknownthatobesityimpairssleep,soperhapspeoplegetfatfirstandsleeplessafterwards.Butthenurses’studysuggeststhatitcanworkintheotherdirectiontoo:sleeplossmayprecipitateweightgain.Althoughgettingfiguresisdifficult,itappearsthatwereallyare

7、sleepingless.In1960peopleintheUSsleptanaverageof8.5hourspernight.A2002pollbytheNationalSleepFoundationsuggeststhattheaveragehasfallentounder7hours,andthedeclineismirroredbytheincreaseinobesity.2. ClimatecontrolWehumans,likeallwarm-bloodedanimals,cankeepourcorebodytempera

8、turesprettymuchconstantregardlessofwhat’sgoingonintheworldaroundus.Wedothisbyalteringourmetabolic(新陈代谢的