高中英语课时作业（译林版必修第三册）课时作业(一)

课时作业(一)Unit1SectionⅠWeletotheunit&ReadingⅠ.阅读理解ATheendangeredpandasintheQinlingMountainsmightfaceanewthreat(威胁):thelossoftheirfood,bamboo,whichmakesup99%oftheirmeals.Adultpandasspendmostofthetimeeatingbambooandhavetotakeinatleast40poundsadaytostayhealthy.However,anewstudywarnedthattheymightsoonfindtheirfoodgonebecausemostofthebamboointheQinlingMountainsmightdisappearbytheendofthecenturyasaresultoftherisingtemperature.AteammadeupofresearchershasstudiedtheeffectsofclimatechangeonthebamboointheQinlingMountains.Theyhavefoundthatbambooisverysensitivetoclimatechange.“80%to100%ofthebamboowillbegoneiftheaveragetemperatureincreasesbydegreesCentigradeworldwidebytheendofthecentury，”saidLiuJianguo,oneofthereport'sauthors.Headded,“Thisishowmuchthetemperaturewillriseby2100evenifallcountrieskeeptheirpromisesintheParisAgreement.Butyouknowwhatishappeningaroundtheworld.”Inrecentyears,Chinahasbeentryingitsbesttoprotecttheendangeredpandasbysettingupmoreandbiggernaturereserves(保护区)．“Butitisfarfromenoughandtheendangeredpandasneedcooperationfromtherestoftheworld,becausetheirfutureisnotjustinthehandsoftheChinese，”saidShirleyMartinfromWorldWildlifeFundbutnotamemberoftheteam.TheQinlingMountainsarehometoabout345pandas.Thatisabout18%oftheChina'swildpandapopulation.Inaddition,about375arelivinginresearchcentersandzoosinChina.1．Whatcanwelearnfromthefirstparagraph?A．LotsofthebamboointheQinlingMountainswillprobablydisappear.B．TheQinlingMountainscannotprovideenoughbambooforthepandas.C．PandasintheQinlingMountainsarejustthreatenedwiththelossoffood.D．Pandashavealreadyeaten99%ofthebamboointheQinlingMountains.2．WhatdidLiuJianguomean?A．ChinaneedsmorehelpfromWorldWildlifeFund.B．Thecurrentclimateisnotsuitableforbambooanymore.C．Chinaismakinggreateffortstoprotectthepandas.D．Itisdifficulttopreventthetemperaturefromrisingby℃.3．HowmanywildpandasarethereinChina?A．About345. B．About720.C．About1，900. D．About2，275.4.Whichcanbethebesttitleforthetext?A．TheDisappearanceofBambooB．NecessityofChangingPandas'FoodC．EffortsMadetoSavePandasD．ANewThreatFacedbyPandasBAstudyhasfoundthatalifetimeofregularexerciseandactivitycanslowdowntheagingprocess(衰老过程).Researcherssaythatgettingoldershouldnotnecessarilymeanbeingweakerorsicker.Theirresearchshowsthatthedevotiontoalifeofmovementandexercisemayhelpuslivenotonlylonger,butalsomorehealthily.Fortheirstudy,theresearchersstudiedtwogroups.Thefirstgroupwasmadeupof125non­professionalcyclistsbetweentheagesof55and79.Thisgroupincluded84healthymenand41healthywomen.Thisgroupwascalledthe“cyclists”．Researchersthenfound130peopletomakeupthesecondgroup.Withinthisgroup,75peoplewereagedfrom57to80.Theother55werebetweentheagesof20and36.Thepeopleinthisgroupwerealsohealthy,buttheydidnotexerciseregularly.Thisgroupwascalledthe“non­exercisers”.Smokers,heavydrinkersofalcoholandpeoplewithotherhealthissueswerenotincludedinthestudy.Then,researchersgavebothgroupsaseriesoftests.Theytestedtheirmusclemass(肌肉质量),muscularstrength,percentageofbodyfatandthestrengthoftheirimmunesystems(免疫系统).Thentheresearchersparedtheresultsofthetwogroups.Resultsshowedthatthecyclistsdidnotexperiencebodychangesusuallyregardedasanormalagingprocess.Forexample,theydidnotlosemusclemassormuscularstrength.Also,theirbodyfatdidnotincreasewithage.Theresearchersalsofoundsomethingtheyhadnotexpected.Thestudyshowedthattheimmunesystemsofthecyclistsdidnotageeither.Theresearchersadviseusalltofindtheexercisethatwelikeinourlives.5．Howdidtheresearcherscarryoutthestudy?A．Byparison.B．Throughdiscussion.C．Byimagination.D．Byreasoning.6．Whichofthefollowingisaresultoftheresearch?A．Thecyclistskeptthin.B．Thenon­exercisersgainedweighteasily.C．Thecyclists'musclesremainedstrongwithage.D．Thenon­exercisersusuallyhadhealthproblems.7．Whichisanunexpectedresultfortheresearchers?A．Thecyclistshadthenormalagingprocess.cyclists'immunesystemsdidn'tage.C．Thecyclistslostnearlyalltheirfat.D．Everyoneneededexerciseintheirlives.8．Whichofthefollowingcanbethebesttitleforthetext?A．HealthyPeopleNeedMoreExerciseB．TakeExercise:theHarder,theBetterC．CyclingIstheBestWaytoPreventAgingD．ALifetimeofExerciseSlowstheAgingProcessⅡ.完形填空AsourEarth'stemperaturewarmsupbecauseofclimatechange,itishavingunexpectedeffectsonourworld'sforests.Whentemperaturesrise,treesclosetheirskinsto__1__thelossofwater,andthis,inturn,slowsdownthe__2__ofphotosynthesis(光合作用).Asaresult,thesetreesareshorterandgrowslowly,aswellashavea__3__deathrate.Climatechangealsoincreasesthe__4__ofdroughtsandwildfires.Afterwildfires,ittakesawhilefortheforestsystemsto__5__，andinsomecases,theforestsare__6__permanently.Treesthatarestressedarealso__7__toattacksbybacteria(细菌).Intropicalforests,vinesthatusethetreesas__8__canoftenchokethetreesandrobthemofnutrients.Finally,humanshave__9__theforestlandscapethroughlogging.Whentreesarereplantedonthesoil,theywillnevergrowaslargeasthe__10__treesthatwerecutdown.Astheseforestsdisappear,speciesthatoncecalledthem“home”areforcedtochange,__11__thevarietyofthosesystems.__12__，someendangeredspeciesareunableto__13__anddie.Old­growthforestsaredisappearinginallregionsofourworld.Whenforestsdie,youngerforeststhatarereestablishedinthesameareagrowbackweakerandsmaller__14__poorvegetation(植被).Withtreesdyingincreasinglyandcontinuously,willfuturegenerations__15__outonthewondersofforests?1． B．preventC．save D．free2． B．situationC．process D．operation3． B．firmerC．lighter D．smaller4． B．measureC．qualification D．chance5．