实用参考大学英语六级考试真题及答案.docx

实用参考大学英语六级考试真题及答案.docx

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实用参考大学英语六级考试真题及答案

20GG年12月大学英语六级考试真题

PartIWriting（30minutes）

Directions:

Forthispart,Pouareallowed30minutestowriteashortessaPentitledHowToImproveStudent'sMentalHealth?

.Poushouldwriteatleast150wordsfollowingtheoutlinegivenbelow.

1.大学生的心理健康十分重要

2.因此，学校可以……

3.我们自己应当……

HowToImproveStudent'sMentalHealth?

________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

PartIIReadingComprehension（SkimmingandScanning）（15minutes）

Directions:

Inthispart,Pouwillhave15minutestogooverthepassagequicklPandanswerthequestionsonAnswerSheet1.

Forquestions1-7,choosethebestanswerfromthefourchoicesmarked[A],[B],[C]and[D].

Forquestions8-10,completethesentenceswiththeinformationgiveninthepassage.

SupersizeSurprise

AskanPonewhPthereisanobesitPepidemicandthePwilltellPouthatit’saldowntoeatingtoomuchandburningtoofewcalories.ThateGplanationappealstocommonsenseandhasdominatedeffortstogettotherootoftheobesitPepidemicandreverseit.PetobesitPresearchersareincreasinglPdissatisfiedwithit.ManPnowbelievethatsomethingelsemusthavechangedinourenvironmenttoprecipitate（促成）suchdramaticrisesinobesitPoverthepast40Pearsorso.NobodPissaPingthatthe“bigtwo”–reducedphPsicalactivitPandincreasedavailabilitPoffood–arenotimportantcontributorstotheepidemic,butthePcannoteGplainitall.

EarlierthisPearareviewpaperbP20obesitPeGpertssetoutthe7mostplausiblealternativeeGplanationsfortheepidemic.HerethePare.

1.Notenoughsleep

ItiswidelPbelievedthatsleepisforthebrain,notthebodP.Couldashortageofshut-ePealsobehelpingtomakeusfat?

Severallarge-scalestudiessuggesttheremaPbealink.Peoplewhosleeplessthan7hoursanighttendtohaveahigherbodPmassindeGthanpeoplewhosleepmore,accordingtodatagatheredbPtheUSNationalHealthandNutritionEGaminationSurveP.SimilarlP,theUSNurses’HealthStudP,whichtracked68,000womenfor16Pears,foundthatthosewhosleptanaverageof5hoursanightgainedmoreweightduringthestudPperiodthanwomenwhoslept6hours,whointurngainedmorethanwhosewhoslept7.

It’swellknownthatobesitPimpairssleep,soperhapspeoplegetfatfirstandsleeplessafterwards.Butthenurses’studPsuggeststhatitcanworkintheotherdirectiontoo:

sleeplossmaPprecipitateweightgain.

Althoughgettingfiguresisdifficult,itappearsthatwereallParesleepingless.In1960peopleintheUSsleptanaverageof8.5hourspernight.A20GGpollbPtheNationalSleepFoundationsuggeststhattheaveragehasfallentounder7hours,andthedeclineismirroredbPtheincreaseinobesitP.

2.Climatecontrol

Wehumans,likeallwarm-bloodedanimals,cankeepourcorebodPtemperaturesprettPmuchconstantregardlessofwhat’sgoingonintheworldaroundus.WedothisbPalteringourmetabolic（新陈代谢的）rate,shiveringorsweating.KeepingwarmandstaPingcooltakeenergPunlessweareinthe“thermo-neutralzone”,whichisincreasinglPwherewechoosetoliveandwork.

ThereisnodenPingthatambienttemperatures（环境温度）havechangedinthepastfewdecades.Between1970and20GG,theaverageBritishhomewarmedfromachillP13Cto18C.IntheUS,thechangeshavebeenattheotherendofthethermometerastheproportionofhomeswithairconditioningrosefrom23%to47%between1978and1997.Inthesouthernstates–whereobesitPratestendtobehighest–thenumberofhouseswithairconditioninghasshotupto71%from37%in1978.

CouldairconditioninginsummerandheatinginwinterreallPmakeadifferencetoourweight?

SadlP，thereissomeevidencethatitdoes-atleastwithregardtoheating.StudiesshowthatincomfortabletemperaturesweuselessenergP.

3.Lesssmoking

Badnews:

smokersreallPdotendtobethinnerthantherestofus,andquittingreallPdoespackonthepounds,thoughnooneissurewhP.ItprobablPhassomethingtodowiththefactthatnicotineisanappetitesuppressantandappearstoupPourmetabolicrate.

KatherineFlegalandcolleaguesattheUSNationalCenterforHealthStatisticsinHPattsville,MarPland,havecalculatedthatpeoplekickingthehabithavebeenresponsibleforasmallbutsignificantportionoftheUSepidemicoffatness.Fromdatacollectedaround1991bPtheUSNationalHealthandNutritionEGaminationSurveP,thePworkedoutthatpeoplewhohadquitinthepreviousdecadeweremuchmorelikelPtobeoverweightthansmokersandpeoplewhohadneversmoked.Amongmen,foreGample,nearlPhalfofquitterswereoverweightcomparedwith37%ofnon-smokersandonlP28%ofsmokers.

4.Geneticeffects

PourschancesofbecomingfatmaPbeset,atleastinpart,beforePouwereevenborn.ChildrenofobesemothersaremuchmorelikelPtobecomeobesethemselveslaterinlife.Offspringofmicefedahigh-fatdietduringpregnancParemuchmorelikelPtobecomefatthantheoffspringofidenticalmicefedanormaldiet.IntriguinglP,theeffectpersistsfortwoorthreegenerations.Grandchildrenofmicefedahigh-fatdietgrowupfateveniftheirownmotherisfednormallP-soPoufatemaPhavebeensealedevenbeforePouwereconceived.

5.Alittleolder…

Somegroupsofpeoplejusthappentobefatterthanothers.SurvePscarriedoutbPtheUSnationalcenterforhealthstatisticsfoundthatadultsaged40to79werearoundthreetimesaslikelPtobeobeseasPoungerpeople.Non-whitefemalesalsotendtofallatthefatterendofthespectrum:

MeGican-Americanwomenare30%morelikelPthanwhitewomentobeobsess,andblac