2026年托福听力阅读真题

2026年托福听力阅读真题阅读部分Passage1TheEcologicalImpactofInvasiveSpeciesonIslandEcosystemsIslandshavelongbeenconsiderednaturallaboratoriesforevolutionarybiologistsduetotheirisolationanduniquebiodiversity.However,thisveryisolationmakesislandecosystemsdisproportionatelyvulnerabletotheintroductionofinvasivespecies.Unlikecontinentallandmasses,whichhavelargeareasandcomplexecologicalnetworksthatcansometimesbufferagainstdisturbances,islandsoftenhavesimplifiedfoodwebsandahighpercentageofendemicspecies—speciesfoundnowhereelseonEarth.Whenaninvasivepredatororcompetitorisintroduced,theconsequencescanbeswift,catastrophic,andoftenirreversible.Oneoftheprimarymechanismsbywhichinvasivespeciesdisruptislandecosystemsisthroughpredationonnativefaunathatlacksevolveddefensesagainstnovelpredators.Forinstance,manyislandbirdsevolvedinenvironmentsfreefrommammalianpredators.Consequently,theyoftenexhibitbehavioraltraitssuchasgroundnestingorflightlessness,whicharemaladaptiveinthepresenceofanimalslikerats,cats,orstoats.TheintroductionofthebrowntreesnaketoGuamfollowingWorldWarIIprovidesastarkexampleofthisdynamic.Withinafewdecades,thesnake,whichlikelyarrivedviamilitarycargoships,decimatedtheisland'snativebirdpopulation,drivingseveralspeciestoextinctionandcausingthelocalextinctionofmostforest-dwellingbirds.Thislossofavianspecieshadacascadingeffectontheforestecosystem,asthebirdsplayedcrucialrolesinseeddispersalandinsectcontrol.Beyonddirectpredation,invasivespeciescanalterthehabitatstructureitself,fundamentallychangingthephysicalenvironmentuponwhichnativespeciesdepend.Invasiveplantsareparticularlynotoriousforthistypeofimpact.Theyoftengrowfaster,reproducemoreprolifically,andlackthenaturalherbivoresthatkeptthemincheckintheirnativeranges.OntheGalápagosIslands,forexample,invasiveplantslikethequininetreeandblackberryhaveoutcompetednativevegetationforsunlightandnutrients.Theseinvasiveplantsformdensemonoculturesthatpreventtheregenerationofnativeendemicplants,suchastheScalesiaforests.Thealterationofvegetationstructurenotonlydisplacesplantspeciesbutalsoreducestheavailabilityoffoodandshelterfornativeanimals,leadingtopopulationdeclinesacrossmultipletrophiclevels.Furthermore,thepresenceofinvasivespeciescanleadtonovelinteractionsknownas"invasionalmeltdown,"wherethepresenceofonenon-nativespeciesfacilitatestheestablishmentoramplifiestheimpactofanother.Thissynergisticeffectacceleratesthedegradationoftheecosystem.Forinstance,feralpigsontheHawaiianIslandsrootintheground,creatingwallowsanddisturbingthesoil.Thisdisturbancecreatesopen,barepatchesofearththatareidealcolonizationsitesforinvasiveplantseeds,whichthepigsmayalsospreadthroughtheirfeces.Thecombinationofsoildisturbanceandseeddispersalcreatesafeedbackloopthatdegradesnativeforestsfasterthaneitherspeciescouldindependently.Thelossofforestcoverleadstoincreasedrunoffanderosion,whichinturnaffectsnearshorecoralreefs,demonstratingtheinterconnectednessofterrestrialandmarineenvironments.Conservationeffortstomitigatetheseimpactsareoftencostlyandlabor-intensive.Eradicationprograms,suchasaerialdropsofpoisonbaittoremoveratsorstoatsfromNewZealandislands,haveshownsuccessinrestoringnativebiodiversity.However,thesemethodsarenotwithoutcontroversyandrisk.Onceaninvasivespecieshasbecomeestablishedonalargeislandoracontinent,completeeradicationisrarelyfeasible,shiftingthefocustocontrolandcontainment.Thechallengeforthefutureliesinenhancingbiosecuritymeasurestopreventintroductionsinthefirstplace,astheecologicalcostoffailureisoftenthepermanentlossofuniqueevolutionarylineages.1.Theword"disproportionately"inthepassageisclosestinmeaningtoA.unfairlyB.excessivelyC.relativelyD.temporarily2.Accordingtoparagraph2,whyareislandbirdsparticularlyvulnerabletoinvasivepredators?A.Theyaregenerallysmallerinsizethaninvasivepredators.B.Theyoftennestonthegroundorcannotfly.C.Theyhavealimitedfoodsupplyonislands.D.Theyareattractedtothenovelpredators.3.Theauthormentionsthebrowntreesnakeinparagraph2inordertoA.illustratethespeedatwhichsomereptilescanreproduce.B.provideevidenceofhowmilitaryoperationsaffectlocalwildlife.C.demonstratethedevastatingimpactasingleinvasivespeciescanhave.D.argueforstricterregulationsoncargoshipments.4.Theword"prolifically"inthepassageisclosestinmeaningtoA.abundantlyB.dangerouslyC.specificallyD.aggressively5.Accordingtoparagraph3,howdoinvasiveplantsliketheblackberryaffecttheGalápagosIslands?A.Theypoisonthenativesoilwithtoxins.B.Theypreventnativeplantsfromregeneratingbydominatingresources.C.Theyintroducenewinsectsthatdestroynativecrops.D.Theygrowonlyinareaswherenativeplantshavealreadydied.6.Whichofthesentencesbelowbestexpressestheessentialinformationinthehighlightedsentenceinthepassage?A.Thepigseattheinvasiveplants,whichpreventstheplantsfromspreading.B.Thepigsandtheplantsworktogethertodamagetheecosystemfasterthantheycouldalone.C.Thepigsareunabletodiginthehardsoilwithoutthehelpoftheplants.D.Theinvasiveplantsprotectthepigsfromnativepredatorsbyprovidingcover.7.Theterm"invasionalmeltdown"referstoA.theextinctionofanativespeciesduetoclimatechange.B.theinabilityofanecosystemtorecoverfromanaturaldisaster.C.asituationwheremultipleinvasivespeciesworseneachother'simpact.D.thefinancialcostoffailederadicationprograms.8.Accordingtoparagraph4,howdoferalpigscontributetothespreadofinvasiveplantsinHawaii?A.Byeatingthenativeplantsthatcompetewithinvasiveones.B.Bycarryingseedsintheirfurandfeces.C.Bydiggingthesoilwhichcreatesidealspotsforseedstogrow.D.BothBandC.9.Lookatthefourletters[A,B,C,D]thatindicatewherethefollowingsentencecouldbeaddedtothepassage.Consequently,theyoftenexhibitbehavioraltraitssuchasgroundnestingorflightlessness,whicharemaladaptiveinthepresenceofanimalslikerats,cats,orstoats.Wherewouldthesentencebestfit?A.Manyislandbirdsevolvedinenvironmentsfreefrommammalianpredators.[A]Consequently,theyoftenexhibitbehavioraltraitssuchasgroundnestingorflightlessness,whicharemaladaptiveinthepresenceofanimalslikerats,cats,orstoats.[B]Theintroductionofthebrowntreesnake...B.Manyislandbirdsevolvedinenvironmentsfreefrommammalianpredators.Consequently,theyoftenexhibitbehavioraltraitssuchasgroundnestingorflightlessness,whicharemaladaptiveinthepresenceofanimalslikerats,cats,orstoats.[A]Theintroductionofthebrowntreesnake...[B]C....unlikecontinentallandmasses...[A]Consequently,theyoftenexhibitbehavioraltraitssuchasgroundnestingorflightlessness,whicharemaladaptiveinthepresenceofanimalslikerats,cats,orstoats.[B]Manyislandbirds...D...plexecologicalnetworks...[A]Consequently,theyoftenexhibitbehavioraltraitssuchasgroundnestingorflightlessness,whicharemaladaptiveinthepresenceofanimalslikerats,cats,orstoats.[B]Unlikecontinentallandmasses...10.Directions:Anintroductorysentenceforabriefsummaryofthepassageisprovidedbelow.CompletethesummarybyselectingtheTHREEanswerchoicesthatexpressthemostimportantideasinthepassage.Somesentencesdonotbelonginthesummarybecausetheyexpressideasthatarenotpresentedinthepassageorareminorideasinthepassage.Theintroductionofnon-nativespeciestoislandecosystemsposesseverethreatstonativebiodiversity.A.Islandsarevulnerablebecausetheyhavesimplifiedfoodwebsandmanyendemicspecies.B.Invasivepredators,suchasthebrowntreesnake,cancausetheextinctionofnativebirds.C.Invasiveplantscanalterhabitatstructure,outcompetingnativefloraandchangingtheecosystem.D.Mostinvasivespeciesarriveonislandsthroughnaturalmigrationpatterns.E."Invasionalmeltdown"occurswhendifferentinvasivespeciesfacilitateeachother'snegativeeffects.F.Conservationeffortsaregenerallyunnecessaryduetothenaturalresilienceofislands.Passage2TheDevelopmentoftheChronometerandtheLongitudeProblemDeterminingone'spositionatseahasbeenafundamentalchallengefornavigatorsthroughouthistory.WhilelatitudecouldbeestablishedrelativelyeasilybymeasuringtheangleofthesunortheNorthStarabovethehorizon,calculatinglongitudepresentedafarmoreintractableproblem.Thisinabilitytoaccuratelydetermineeast-westpositionledtonumerousshipwrecksandlossoflifeatsea.Inthe18thcentury,theBritishgovernmentrecognizedtheseverityofthismaritimehazardand,in1714,establishedtheBoardofLongitudeandofferedaprizeof£20,000(equivalenttomillionstoday)foranyonewhocoulddeviseapracticalmethodfordetermininglongitudeatseatowithinhalfadegree.Theprevailingastronomicalmethodforcalculatinglongitudereliedontheconceptof"lunardistance."Thistechniqueinvolvedmeasuringtheangulardistancebetweenthemoonandaspecificstar(orthesun)andcomparingthisobservationwithpublishedtablesthatpredictedthemoon'spositionatagiventimeinGreenwich,England.Sincethemoonmovesacrosstheskyrelativelyquickly,itcouldserveasacelestialclock.However,thismethodwasnotoriouslydifficulttoperformontherollingdeckofaship.Itrequiredpreciseinstrumentstomeasurethetinyangles,andthecomplexcalculationsneededtoaccountforthemoon'serraticorbitcouldtakehourstocomplete,oftenleadingtoerrors.WhilesignificantimprovementsweremadetothelunartablesbyastronomerslikeTobiasMayer,themethodremainedcumbersomeandpronetoinaccuracyunderroughconditions.Analternativesolution,championedbyaclockmakernamedJohnHarrison,approachedtheproblemthroughmechanicsratherthanastronomy.Harrisonreasonedthatifonecouldcarryaprecisetimekeeperaboardashipthatkepttheexacttimeofaknownreferencepoint(usuallythehomeport),longitudecouldbecalculatedbycomparingthelocaltimeatsea(determinedbythesun'sposition)withthereferencetime.Thedifferenceintimewouldcorrespondtoadifferenceinlongitude,astheEarthrotates15degreesperhour.Thechallenge,however,wasconstructingaclockthatcouldwithstandtheviolentmotionofaship,theextremevariationsintemperatureandhumidity,andthecorrosivesaltair,allofwhichcausedstandardpendulumclocksoftheeratodriftwildlyorstopfunctioning.Harrisondedicatedhislifetosolvingthisengineeringpuzzle.Between1730and1765,hedevelopedaseriesoffivetimekeepers,knownasH1throughH5.Hisearlymodelswerelarge,brassmachinesthatutilizedspring-drivenmechanismsandnovelbalancestocounteractthemotionoftheship.Whiletheyshowedpromise,theywerenotaccurateenoughtowinthefullprize.Harrison'sbreakthroughcamewithH4,apocketwatchratherthanalargeclock.Byincorporatingatemperaturecompensationmechanism(usingabimetallicstriptoadjustthespring'slength)andhigh-frictionescapements,H4achievedunprecedentedaccuracy.DuringaseatrialtoJamaicaandback,H4lostonlyfiveseconds,wellwithintheBoardofLongitude'srequirements.DespitethesuccessofH4,Harrisonfacedsignificantresistancefromthescientificestablishment,particularlytheastronomersontheBoardofLongitudewhowerebiasedtowardthelunardistancemethod.TheyarguedthatamechanicalwatchcouldneverbereplicatedreliablyorcheaplyenoughforwidespreaduseintheRoyalNavy.IttookthedirectinterventionofKingGeorgeIIIandadditionaltestingtofinallysecureHarrisontheremainderoftheprizemoney.Eventually,themarinechronometer,asHarrison'sinventioncametobeknown,becameanessentialtoolfornavigation.Bytheearly19thcentury,improvementsinmanufacturingallowedthesecomplexinstrumentstobeproducedingreaternumbers,revolutionizingmaritimetravelandexploration.Theabilitytopinpointaship'slocationwithcertaintynotonlysavedlivesbutalsoopeneduptheworld'soceansforsafertradeandmoreaccuratemapping.11.Theword"intractable"inthepassageisclosestinmeaningtoA.difficulttosolveB.easilymanagedC.scientificallyinterestingD.physicallydemanding12.Accordingtoparagraph2,whywasthelunardistancemethoddifficultforsailorstouse?A.Itrequiredcomplexcalculationsthatwerehardtoperformonaship.B.Themoonisoftennotvisibleduringtheday.C.Thetablespredictingthemoon'spositionwereoftenlostatsea.D.Itcouldonlybeusedwhentheshipwasneartheequator.13.WhatdoestheauthorimplyaboutJohnHarrison'sbackground?A.HewasamemberoftheRoyalNavy.B.Hewasanastronomerwhodisagreedwiththelunardistancemethod.C.Hewasaskilledcraftsmanratherthanatraditionalscientist.D.HewasawealthymerchantwhofundedtheBoardofLongitude.14.Accordingtoparagraph3,howwaslongitudedeterminedusingamechanicaltimekeeper?A.Bymeasuringtheangleofthemoonrelativetotheship.B.Bycomparingthelocaltimewiththetimeatthehomeport.C.Bytrackingthedistancetheshiptraveledusingalogline.D.ByobservingtherotationofthestarsaroundtheNorthStar.15.Theword"drift"inthepassageisclosestinmeaningtoA.moveslowlyB.loseaccuracyC.floatawayD.changedirection16.WhydoestheauthormentionH4'sperformanceonthetrialtoJamaica?A.Toshowthatsmallerclocksweremoredurablethanlargerones.B.Todemonstratethattheaccuracyrequirementwasfinallymet.C.ToexplainwhyHarrisondecidedtostopmakinglargerclocks.D.Toprovethatthelunardistancemethodwasobsolete.17.WhichofthefollowingcanbeinferredabouttheBoardofLongitudefromparagraph5?A.TheywereeagertoawardtheprizetoHarrison.B.Theywerecomposedmostlyofengineersandclockmakers.C.Theyfavoredthelunardistancemethodduetotheirscientificbackground.D.Theydidnotbelievethatlongitudewasimportantfornavigation.18.Accordingtothepassage,whatwasthelong-termimpactofthemarinechronometer?A.Itmadethelunardistancemethodillegal.B.Itallowedforsaferandmoreaccuratemaritimenavigation.C.ItcausedadeclineintheBritishshipbuildingindustry.D.Itenabledthediscoveryofnewcontinents.19.Lookatthefourletters[A,B,C,D]thatindicatewherethefollowingsentencecouldbeaddedtothepassage.Thedifferenceintimewouldcorrespondtoadifferenceinlongitude,astheEarthrotates15degreesperhour.Wherewouldthesentencebestfit?A....longitudecouldbecalculatedbycomparingthelocaltimeatsea(determinedbythesun'sposition)withthereferencetime.[A]Thedifferenceintimewouldcorrespondtoadifferenceinlongitude,astheEarthrotates15degreesperhour.[B]Thechallenge,however,wasconstructingaclock...B....longitudecouldbecalculatedbycomparingthelocaltimeatsea(determinedbythesun'sposition)withthereferencetime.Thedifferenceintimewouldcorrespondtoadifferenceinlongitude,astheEarthrotates15degreesperhour.[A]Thechallenge,however,wasconstructingaclock...[B]C....Harrisonreasonedthatifonecouldcarryaprecisetimekeeper...[A]Thedifferenceintimewouldcorrespondtoadifferenceinlongitude,astheEarthrotates15degreesperhour.[B]Thechallenge,however,wasconstructingaclock...D....determiningone'spositionatsea...[A]Thedifferenceintimewouldcorrespondtoadifferenceinlongitude,astheEarthrotates15degreesperhour.[B]Whilelatitudecouldbeestablished...20.Directions:Anintroductorysentenceforabriefsummaryofthepassageisprovidedbelow.CompletethesummarybyselectingtheTHREEanswerchoicesthatexpressthemostimportantideasinthepassage.Somesentencesdonotbelonginthesummarybecausetheyexpressideasthatarenotpresentedinthepassageorareminorideasinthepassage.Theproblemofdetermininglongitudeatseawasamajorobstacletosafenavigationuntilthe18thcentury.A.TheBritishgovernmentestablishedtheBoardofLongitudetofindasolutiontothelongitudeproblem.B.Thelunardistancemethodwasaccuratebutrequiredcomplexcalculationsandinstruments.C.JohnHarrisoninventedthemarinechronometer,amechanicaltimekeeperthatsolvedtheproblem.D.Sailorsoftenreliedondeadreckoningbecausetheydidnotknowhowtouseacompass.E.Harrisonfacedoppositionfromastronomerswhopreferredthelunardistancemethod.F.Thechronometereventuallybecamethestandardtoolfornavigation,improvingsafetyandtrade.Passage3TheEconomicsofInformationAsymmetryInstandardeconomicmodelsoftheperfectmarket,itisoftenassumedthatbothbuyersandsellershaveequalaccesstoinformationregardingthequalityandpriceofgoods.Thisassumptionofperfectinformationallowsforthe"invisiblehand"ofthemarkettofunctionefficiently,allocatingresourcesoptimally.However,intherealworld,thisconditionisrarelymet.Informationasymmetryoccurswhenonepartyinatransactionpossessesmoreorbetterinformationthantheother.Thisimbalancecanleadtomarketfailures,wherethemarketmechanismdoesnotproducethemostefficientorequitableoutcome.Thestudyofinformationasymmetry,whichearnedeconomistsGeorgeAkerlof,MichaelSpence,andJosephStiglitztheNobelPrize,highlightshowmarketscanunravelwhentrustisabsent.Themostfamousexampleofinformationasymmetryisthe"marketforlemons,"theorizedbyGeorgeAkerlof.Considertheusedcarmarket.Sellersknowthetruequalityoftheirvehicles—whethertheyarereliable"peaches"ordefective"lemons."Buyers,however,cannoteasilydistinguishbetweenthetwowithoutincurringsignificantinspectioncosts.Becausebuyerscannottellthedifference,theyareonlywillingtopayanaveragepricebasedontheprobabilityofgettingagoodcar.Atthisaverageprice,sellersofhigh-quality"peaches"areunwillingtosell,astheyknowtheircarisworthmorethantheaverage.Consequently,theywithdrawfromthemarket.Thisleavesonlythe"lemons"forsale.Realizingthis,buyersfurtherlowerthepricetheyarewillingtopay.Thisfeedbackloopcontinuesuntilthemarketforhigh-qualityusedcarscollapsesentirely,aphenomenonknownasadverseselection.Theresultisasituationwhereonlytheworstgoodsaretraded,despitetheexistenceofbuyersandsellerswhowouldprefertotradebettergoods.Tomitigatetheproblemscausedbyinformationasymmetry,marketsrelyonsignalingandscreening.Signalingoccurswhentheinformedparty(theseller)takesactiontocrediblyrevealtheirprivateinformationtotheuninformedparty.Forinstance,inthelabormarket,jobapplicantsknowtheirownskilllevelbetterthanemployersdo.Aworkerwithhighproductivitycansignaltheirabilitytotheemployerbyacquiringacollegedegree.Thedegreeitselfmaynotdirectlyimprovejobperformance,butitservesasacostlysignalthatonlyacapableworkerislikelytoobtain.Thisconcept,developedbyMichaelSpence,explainswhyeducationalcredentialsarevaluedeveninjobswherethecurriculumseemsirrelevanttotheactualwork.Conversely,screeningoccurswhentheuninformedparty(thebuyeroremployer)createsamechanismtoelicitthetruthfromtheinformedparty.Insurancecompanies,forinstance,faceadverseselectionbecauseindividualsknowtheirownhealthrisksbetterthantheinsurer.Ifacompanysetsapremiumbasedontheaverageriskofthepopulation,healthypeoplemightoptout,leavingonlyhigh-riskindividuals.Tocounterthis,insurersdesigncontractswithdifferentdeductiblesandcoveragelimits.Apersonwhoknowstheyarealow-riskdriverwillchooseapolicywithahighdeductibleandlowerpremium,whileahigh-riskdriverwillprefercomprehensivecoveragewithalowdeductible.Byself-selectingintodifferentplans,customersrevealtheirprivateriskinformationtotheinsurer.Theimplicationsofinformationasymmetryextendbeyondspecificmarketstothebroadereconomy.Itexplainswhyintermediaries,suchascardealershipsandrealestateagents,exist—toactasguarantorsofqualityandreducethetransactioncostsofverifyinginformation.Italsoexplainstheprevalenceofwarranties,brandnames,andgovernmentregulations.Lawsrequiring"truthinlending"ormandatorydisclosureinfoodsafetyareinstitutionalresponsesdesignedtoleveltheplayingfield.Byreducingtheinformationgap,thesemechanismshelprestoreconfidenceandallowmarketstofunctionmoresmoothly,preventingthe"lemons"problemfromdestroyingeconomicvalue.21.Theword"optimal"inthepassageisclosestinmeaningtoA.theoreticalB.bestpossibleC.fixedD.financial22.Accordingtoparagraph2,whydoesthemarketforhigh-qualityusedcarscollapse?A.Buyersarenotinterestedinbuyingusedcars.B.Sellersofgoodcarsrefusetosellattheaveragepriceofferedbyuninformedbuyers.C.Thegovernmentregulatesthepriceofusedcarstoostrictly.D.Itisimpossibletorepairadefective"lemon."23.Inthecontextofthepassage,whatis"adverseselection"?A.Astrategyusedbybuyerstonegotiatelowerprices.B.Thetendencyforhigh-qualitygoodstodisappearfromthemarketduetoinformationimbalance.C.Agovernmentpolicytoprotectconsumersfromfraud.D.Theselectionofaproductbasedonitsbrandname.24.Accordingtoparagraph3,howdoesacollegedegreefunctionasasignalinthelabormarket?A.Itguaranteesthattheworkerwillstayatthecompanyforalongtime.B.Itprovesthattheworkerhasspecifictechnicalskillsrequiredforthejob.C.Itdemonstratesthattheworkerhasthepersistenceandabilitytocompleteadifficulttask.D.Itallowstheemployertopaytheworkeralowersalary.25.Theword"elicit"inthepassageisclosestinmeaningtoA.hideB.drawoutC.confirmD.ignore26.Whydoinsurancecompaniesofferpolicieswithdifferentdeductibles?A.Toconfusecustomersandmakemoreprofit.B.Tocomplywithgovernmentregulationsregardinghealthcare.C.Toencouragecustomerstorevealtheirrisklevels.D.Toensurethatonlywealthypeoplecanbuyinsurance.27.WhichofthefollowingisNOTmentionedinparagraph5asawaytoreduceinformationasymmetry?A.Intermediarieslikecardealerships.B.Warrantiesandbrandnames.C.Governmentregulations.D.Loweringthepriceofgoods.28.Theauthor'sprimarypurposeinthepassageistoA.argueagainstgovernmentinterventionintheeconomy.B.explainthecausesandeffectsofinformationasymmetryinmarkets.C.comparethetheoriesofAkerlof,Spence,andStiglitz.D.describethehistoryoftheusedcarmarket.29.Lookatthefourletters[A,B,C,D]thatindicatewherethefollowingsentencecouldbeaddedtothepassage.Thisfeedbackloopcontinuesuntilthemarketforhigh-qualityusedcarscollapsesentirely,aphenomenonknownasadverseselection.Wherewouldthesentencebestfit?A....theyareonlywillingtopayanaveragepricebasedontheprobabilityofgettingagoodcar.[A]Thisfeedbackloopcontinuesuntilthemarketforhigh-qualityusedcarscollapsesentirely,aphenomenonknownasadverseselection.[B]Theresultisasituationwhereonlytheworstgoodsaretraded...B....Realizingthis,buyersfurtherlowerthepricetheyarewillingtopay.[A]Thisfeedbackloopcontinuesuntilthemarketforhigh-qualityusedcarscollapsesentirely,aphenomenonknownasadverseselection.[B]Theresultisasituationwhereonlytheworstgoodsaretraded...C....Sellersknowthetruequalityoftheirvehicles...[A]Thisfeedbackloopcontinuesuntilthemarketforhigh-qualityusedcarscollapsesentirely,aphenomenonknownasadverseselection.[B]Buyers,however,cannoteasilydistinguish...D....Consequently,theywithdrawfromthemarket.[A]Thisfeedbackloopcontinuesuntilthemarketforhigh-qualityusedcarscollapsesentirely,aphenomenonknownasadverseselection.[B]Realizingthis,buyersfurtherlower...30.Directions:Anintroductorysentenceforabriefsummaryofthepassageisprovidedbelow.CompletethesummarybyselectingtheTHREEanswerchoicesthatexpressthemostimportantideasinthepassage.Somesentencesdonotbelonginthesummarybecausetheyexpressideasthatarenotpresentedinthepassageorareminorideasinthepassage.Informationasymmetrycanleadtomarketinefficiencies,butvariousmechanismsexisttoaddressit.A.The"marketforlemons"showshowasymmetricinformationcandrivehigh-qualityproductsoutofthemarket.B.GeorgeAkerlofwontheNobelPrizeforhisworkonusedcarrepair.C.Signalingandscreeningarestrategiesusedbyinformedanduninformedpartiestoshareinformation.D.Perfectinformationisacommonfeatureofmostmodernmarkets.E.Institutionslikewarrantiesandregulationshelpmitigatetheeffectsofinformationasymmetry.F.Sellersalwaysbenefitfromhavingmoreinformationthanbuyers.听力部分Conversation1Narrator:Listentoaconversationbetweenastudentandauniversitylibrarian.Student:Hi,Iwaswonderingifyoucouldhelpme.I'mdoingsomeresearchformyarthistoryclassontheItalianRenaissance,specificallyonthearchitecturaltechniquesusedinFlorenceduringthe15thcentury.Librarian:Thatsoundslikeafascinatingtopic.Wehaveasubstantialcollectionofarthistoryjournalsandbooks.Areyoulookingforprimarysourcesorsecondaryanalysis?Student:Ineedamixofboth,actually.Myprofessorwantsustofindsomeoriginalarchitecturaltreatisesifpossible.IknowLeonBattistaAlbertiwroteDereaedificatoria,butI'mnotsureifthelibraryhasatranslatedversionorifIhavetogotothespecialcollections.Librarian:WedohaveacopyofAlberti'swork,butit'sintherarebooksroom.It'sa15th-centurymanuscript,soit'snotavailableforcheckout.However,wehaveahigh-resolutiondigitalscanofitthatyoucanaccessthroughthelibrary'sonlineportal.Icanshowyouhowtofindthat.Student:Oh,thatwoul