21四級真題及答案解析第1套在這個快節奏的時代，大多數學生都在為應對各種考試而奮斗。英語四級考試無疑是這其中最重要的一項。而其中的真題及答案解析就成為大家備考的重中之重。接下來，本文將為大家詳細介紹21年四級真題及答案解析第1套。希望對大家的備考有所幫助。閱讀理解文章一LaserSafetyAlaserisadevicethatemitsaverynarrow,intensebeamoflight.Itcanbeusedforavarietyofapplications,suchascutting,burning,orwelding.Laserscanalsobeusedinmedicalapplications,forexample,toremovetattoosortotreattumors.However,sincelasersemitsuchanintensebeamoflight,theycanalsobedangerous.Infact,evenabriefexposuretoalaserbeamcandamagetheeyes.Forthisreason,itisimportanttofollowsafetyprocedureswhenusinglasers.Onecommonsafetyprocedureistowearprotectiveeyewear.Thiseyewearisdesignedtoabsorbtheenergyofthelaserbeamandpreventitfromreachingtheeyes.Itisimportanttowearthecorrecttypeofprotectiveeyewearfortheintendedapplication,sincedifferentlasersemitdifferenttypesofenergy.Anothercommonsafetyprocedureistoensurethatanyonewhoisnotdirectlyinvolvedinthelaseroperationstaysoutofthearea.Lasersafetysignsshouldbepostedtoindicatethatalaserisinuse.Theareashouldalsoberestrictedtoauthorizedpersonnelonly.Whatisthemaintopicofthepassage?A.Theuseoflasersinsurgery.B.Theimportanceoflasersafety.C.Thedifferenttypesoflasers.D.Theadvantagesofusinglasers.答案：B推理判斷題。文章主要講述的是激光的危害以及如何避免激光危害，所以正確答案為B。短語填空1.Recentyearshavewitnessedarapid___ofe-commerceinChina.A.increaseB.improvementC.declineD.decrease答案：A2.Thegovernmenthastakenmeasuresto___highhousingprices.A.reduceB.sellC.raiseD.increase答案：A3.Manypeoplebelievethatthe___ofapersonplaysasignificantroleinhisorhersuccess.A.knowledgeB.intelligenceC.appearanceD.personality答案：B4.Itiswell-knownthata___ofexercisecanleadtohealthproblems.A.rateB.lackC.plentyD.satisfaction答案：B5.Thecompanyisplanningtolaunchanewproductto___itsprofits.A.increaseB.decreaseC.maintainD.minimize答案：A6.Moststudentshaveto___forthelivingexpenseswhilestudyingatcollege.A.payoffB.breakdownC.putawayD.makeup答案：D7.Inorderto___thequalityofeducation,theschoolhasintroducedanewteachingmethod.A.enhanceB.reduceC.destroyD.lower答案：A8.Theprofessor’slecturesare___,somanystudentsprefertoattendhisclass.A.tediousB.complicatedC.challengingD.informative答案：D完形填空Architectureisnotjustaboutbuildingthings.It'saboutcreatingaspaceforpeopleto___1___in.It'saboutshapingtheenvironmentina___2___thatmeetsthepracticaland___3___needsofacommunity,whilealsoinspiringthe___4___andthespirit.Thisiswhyarchitectureisoftencalledtheartofspace.Ittakesengineering,___5___anddesign,andcombinesthemintosomethingboth___6___andfunctional.Architectsmustconsiderallthe___7___thataffectastructure'ssustainability,fromtheangleofthesuntothekindofsoilthefoundationwillsiton.Architectureisnotjustabout___8___ablankslate.Often,anarchitect’sjobisto___9___theoldwiththenew:tocreatesomethingthatismodernandinnovative,whilealsobeingrespectfulofthe___10___environment.Thismeansthatanarchitectmustunderstandthe___11___ofastructure,andhowitinteractswiththeworldaroundit.Finally,anarchitect___12___therelationshipbetweenabuildingandthepeoplewhowilluseit.Anarchitectmustconsiderthe___13___,safetyandcomfortofthebuilding'soccupants,aswellastheir___14___andemotionalneeds.Thisiswhyarchitectureisoftencalledtheartof___15___.1.A.learnB.travelC.liveD.play答案：C2.A.mannerB.situationC.positionD.way答案：D3.A.aestheticB.economicC.politicalD.social答案：D4.A.brainB.soulC.energyD.body答案：B5.A.innovationB.contrastC.emulationD.stability答案：A6.A.profoundB.abstractC.simpleD.complex答案：D7.A.elementsB.circumstancesC.consequencesD.solutions答案：B8.A.organizingB.changingC.preservingD.decorating答案：B9.A.replaceB.hideC.complementD.reject答案：C10.A.localB.naturalC.culturalD.historical答案：B11.A.lifespanB.designC.useD.quality答案：C12.A.underestimatesB.overratesC.dislikesD.values答案：D13.A.layoutB.locationC.healthD.structure答案：C14.A.physicalB.intellectualC.psychologicalD.financial答案：C15.A.natureB.creationC.functionD.communication答案：B聽力理解對話題材料M：Canwegotothebeachtoday?W：Icheckedtheweatherthismorning.It'saprettycolddayoutside.And,actuallyit'sgoingtorain.M：It'ssummer,howcoulditstillbecold?What'sthetemperaturesupposedtobe?W：Itsaysthatit'sinthelow60s.Sotome,that'sprettycold.M：Comeon!Wedon'tgetthatmanyopportunitiestogotothebeach.Let'sjustgoandwe'llbringasweater.W：Itlooksliketherainmightbecominginthisafternoon,andIdon'twanttobesittingonthebeachforthreehourswithasweateron,intherain.M：Ifwegonow,wehaveplentyoftimebeforetheraincomes.W：Canwejustdosomethingelsetoday?Maybecomebacktothebeachtomorrowwhenit'ssupposedtobesunny?Whatisthewoman'smainconcernaboutgoingtothebeach?A.Thecoldtemperature.B.Thepossibilityofgettingwet.C.Thedifficultyofgettingthere.D.Thepotentialforsunburn.答案：B短文題材料It'simportanttodrinkenoughwatereverydaytostayhealthyandhydrated.That'sespeciallytrueduringthesummermonths,whentemperaturesriseanddehydrationismorelikelytooccur.Dehydrationcanleadtoheadaches,fatigue,andmoodchanges,amongothersymptoms.Inseverecases,itcanevenleadtoheatstroke,whichcanbelife-threatening