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Throughouthistorymanhashadtoacceptthefactthatalllivingthingsmustdie.Butpeoplenowlivelongerthanthey36.Yet,alllivingthingsstillshowthe37ofaging,whichwilleventually38deaths.Agingisnotadisease,butasapersonpassesmaturity（成熟期）,thecellsofthebodyandthe39theyformdonotfunctionaswellasthey40inchildhoodandteenageyears.Thebodyprovidesless41againstdiseaseandismore42tohaveaccident.Anumberofrelatedcausesmay43toaging.Somecellsofthebodyhaveafairlylonglife,buttheyarenot44whentheydie.Asapersonages,45ofbraincellsandmusclecellsdecreases.46.bodycellsdieandarereplacedbynewcells.Inanagingpersonthe47cellsmaynotbeasworkableorascapable48growthasthoseofayoungperson.Another49inagingmaybechangeswithinthecells50.Someoftheproteinchemicalsincellsareknownto51withageandbecomelesselastic（有弹性的）.Thisiswhytheskinofoldpeoplewrinkles（皱纹）andhangs52.Thisisalsothereasonwhyoldpeople53inheight.Theremaybeothermoreimportantchemicalchangesinthecells.Somecomplexcellchemicals,suchasDNAanRNA,storeand54informationthatthecellsneed.Agingmayaffectthis55andchangetheinformation-carryingmoleculessothattheydonottransmittheinformationaswell.36.A.wouldB.beusedtoC.usedtoD.used37.A.functionB.effectC.affectD.sign38.A.leadinB.giveinC.runintoD.resultin39.A.handsB.feetC.heartD.organs40.A.madeB.tookC.didD.remembered41.A.energyB.protectionC.vigorD.power42.A.likelyB.probableC.possibleD.alike43.A.attendB.contributeC.addD.devote44.A.replacedB.rebornC.recoveredD.surrendered45.A.anumberB.theamountC.thenumberD.agreatdeal46.A.TheothersB.theotherC.AnotherD.Other47.A.oldB.leftC.newD.other48.A.toB.forC.ofD.in49.A.factorB.effectC.reasonD.element50.A.itB.themC.themselvesD.that51.A.becomeB.turnC.changeD.get52.A.looseB.highC.largeD.fat53.A.increaseB.shrinkC.lengthenD.decrease54.A.passawayB.passbyC.passoffD.passon55.A.improvementB.processionC.approachD.process36——40CBDDC41——45BABAC46——50DCCAC51——55CABDDSwitzerland(瑞士)isfamousforitswatches.However,thiscountrydidn’t16thewatch.ItwastheBritish17didit.Hereisastoryof18thewatchwas19toSwitzerland.Manyyearsago,anEnglishmanwas20toItaly.21hiswayhestoppedinasmalltowninsouthSwitzerland.ThisEnglishmantravelledinacarriageinside22therewasacarriagewatch.Thiswasthe23kindofwatch.Anativeshopassistant24toseethewatch.He25whatitwasandaskedtheEnglishman26it.“Itisacarriagewatch.”saidtheman.“Thismachine27thetimebutnowitisn’tworking.”Atoncetheshopassistant28totrytorepairit.Sothetraveller29himthewatch.Theassistantwasaverywiseman.Soitwasnot30thathemanaged(设法)torepairit.He31rememberedhowitwasmade.Assoonasthetravellerhad32onhisjourney(旅行),hemadeawatchof33thesametype.34thewatch-makingwas35inSwitzerland.TodaySwisswatchesaresoldinstoresallovertheworld.16.A.makeB.inventC.produceD.develop17.A.whichB.whoC.whereD.they18.A.whyB.thatC.howD.when19.A.carriedB.soldC.sailedD.brought20.A.travellingB.ridingC.walkingD.running21.A.OnB.InC.AtD.From22.A.whichB.thatC.itD.whom23.A.properB.smallestC.earliestD.biggest24.A.wantedB.seemedC.happenedD.discovered25.A.wonderedB.thoughtC.understoodD.discovered26.A.onB.aboutC.ofD.with27.A.givesB.tellsC.strikesD.counts28.A.failedB.helpedC.insistedD.offered29.A.servedB.sharedC.showedD.handed30.A.surpriseB.surprisedC.surprisingD.surprises31.A.howeverB.besidesC.butD.even32.A.goneB.doneC.comeD.spent33.A.correctlyB.speciallyC.exactlyD.naturally34.A.ThusB.SoC.OtherwiseD.However35.A.openedB.startedC.doneD.returned16—35BBCDAAACCABBDDCDACABInJanuary2002,duringthefirstweeksofasix-monthstayatthechildren’shospitalofPhiladelphiaforLeukemia(白血病)treatment,Michaelwanderedovertohishospitalwindowinsearchofdistraction(散心).The36first–graderwatchedaconstructioncrew37ona10-storeyadditiontothehospital.38Michael’sthird-floorwindow,Ritchie,aniron-workerfromtheEastFallssectionofPhiladelphia,39andsaw“thiskidwithnohair40facewaspresseduptothewindow.Iwaved,andhesmiledand41I’llneverforgetthat”saysRitchie,afatherofthree.Aswinter42spring,Michaelwatched,fascinated(着迷),as3000tonsofsteel43formedtheskeletonofthebuilding.Onedayhecoloredamessageforthecrewandheld44uptothewindow:Hi,LocalIronWorkers,I’mMike.Ritchieandthe45crewmessagedback.Overthe46months,ashistreatmentcontinued,Ritchieandthecrew47Michaelupandcheeredhimwith48signslikeBeStrongMike.49theconstructionreachedthethirdfloor,Ritchiejumpedacrossthe50betweenthebuildingsandthetwohada51chat.Thehardhatwithtenderheartwellsup(涌出眼泪)whenhethinksaboutit.“Michael52mylife”saysRitchie“Iwasarealhard-core(顽固不化)personwithoutalotofsympathy.ButI’d53seeingthiskideverydaywavingatmeandexcitedabouttheconstruction.Ilookatlife54thankstohim”TodayMichaelisa10-year-oldthird-graderincompleterecovery.Whatdoeshehopeto55whenhegrowsup?”Aconstructionworker.”hesays.36.A.strangeB.curiousC.seriousD.anxious37.A.playingB.studyingC.livingD.working38.A.BelowB.AboveC.UnderD.Over39.A.watchedoutB.watchedatC.lookedupD.lookeddown40.A.whomB.whoseC.whichD.that41.A.camebackB.cameonC.wavedbackD.wavedon42.A.wentoffB.wentoutC.turnedintoD.turnedto43.A.graduallyB.immediatelyC.successfullyD.usually44.A.thatB.itC.oneD.itself45.A.hospitalB.repairC.constructionD.school46.A.firstB.lastC.longD.