2025年1月托福真题及答案

2025年1月托福真题及答案第一部分：阅读Passage1TheCollapseoftheEarlyBronzeAgeCitiesAround2200B.C.,awaveofurbancollapsesweptacrosstheNearEast,bringinganendtotheEarlyBronzeAge.Thisperiod,knownasthe"UrbanCrisis"orthe"FirstDarkAge,"sawtheabandonmentofgreatcitieslikeEbla,Troy,andthecitiesoftheIndusValley.Thecausesofthiswidespreadcollapsehavebeenthesubjectofintensedebateamongarchaeologistsandhistorians.Whileearliertheoriesoftenfocusedonsingle,catastrophicevents,contemporaryscholarshiptendstofavoracombinationofenvironmental,social,andpoliticalfactors.Oneofthemostprominenttheoriesinvolvesclimaticchange.EvidencefromicecoresinGreenlandandsedimentlayersintheMiddleEastsuggeststhataseveredroughtoccurredaround2200B.C.Thisdrought,possiblylastingforseveralcenturies,wouldhavedevastatedagriculturalsystemsthatsupportedtheseurbancenters.InMesopotamia,forinstance,therelianceonirrigationmadeagricultureparticularlyvulnerabletofluctuationsinwatersupply.Ascropyieldsplummeted,theeconomicfoundationofthecity-stateseroded,leadingtofamineandpopulationdecline.Theformulaforcalculatingthereductioninagriculturalyieldbasedonprecipitationdeficitcanbecomplex,butgenerallyfollowsanon-linearrelationshipwhereY=×(1−),whereYisyield,Pisprecipitation,andHowever,climatealonemaynotexplaintheentirephenomenon.SomescholarsarguethattheinternaldynamicsofEarlyBronzeAgesocietiesplayedacrucialrole.Thesesocietieswerehighlycentralized,witharulingelitecontrollingthesurplusproductionofthecountryside.Thiscentralizationcreatedarigidsocialstructurethatmayhavebeenunabletoadapttochangingcircumstances.Asresourcesbecamescarce,theelitemayhaveincreaseddemandsonthepeasantrytomaintaintheirownstandardofliving,leadingtosocialunrestandrebellion.Thedestructionlayersfoundinsomecities,showingevidenceoffireandviolence,supporttheideaofinternalconflictratherthanjustenvironmentalabandonment.Furthermore,theinterconnectednessoftheancientworldthroughtradenetworksmayhaveactedasatransmissionbeltforcollapse.TheEarlyBronzeAgesawtheriseoflong-distancetradeinluxurygoodslikelapislazuli,metals,andtextiles.Whilethistradebroughtwealth,italsocreatedeconomicinterdependence.Ifonemajornodeinthenetworkfailedduetodroughtorinternalstrife,theeconomicrepercussionscouldrippleoutward,causingshortagesandinstabilityindistantregions.This"systemscollapse"theorysuggeststhatthefragilityofthecomplexeconomicandpoliticaltiesmadetheentirecivilizationvulnerabletoacascadingfailure.Finally,theroleofnomadicgroupscannotbeoverlooked.Textualevidencefromlaterperiodsoftenblames"invasions"or"barbarians"forthedestructionofcities.Whileoncedismissedaspropaganda,thereisarchaeologicalevidencetosuggestthatmovementsofpeople,possiblydrivenbyclimatechangeintheirownregions,putpressureontheurbancenters.Thesegroupsmayhaveexploitedtheweakenedstateofthecity-states,acceleratingtheirdecline.Itislikelythatthesemigrantswerenotconquerorsinthetraditionalsense,butrefugeesoropportunistsraidingacrumblingsystem.Inconclusion,thecollapseoftheEarlyBronzeAgecitieswaslikelynottheresultofasingleevent.Instead,itwasa"perfectstorm"whereenvironmentalstress,socialrigidity,economicinterdependence,andpopulationmovementsconverged.Theresilienceoftheseearlyurbancivilizationswastestedbeyondtheirlimits,leadingtoareorganizationofsocietythatwouldcharacterizethesubsequentMiddleBronzeAge.Questions:1.Accordingtoparagraph1,whatisthecurrentscholarlyviewregardingthecollapseoftheEarlyBronzeAgecities?A.Itwascausedprimarilybyforeigninvasions.B.Itwasasuddenandunexplainableevent.C.Itresultedfromacombinationoffactors.D.ItwaslimitedtotheMesopotamianregion.2.Theword"prominent"inthepassageisclosestinmeaningto:A.ControversialB.Well-knownC.ProvenD.Recent3.Accordingtoparagraph2,whywastheagriculturalsysteminMesopotamiaparticularlyvulnerabletodrought?A.Theyreliedheavilyonirrigationsystems.B.Theydidnothavedrought-resistantcrops.C.Thesoilqualitywaspoor.D.Thepopulationwastoolargefortheavailableland.4.WhydoestheauthorincludetheformulaY=A.Toprovethatthedroughtlastedforcenturies.B.Todemonstratethemathematicalsophisticationoftheperiod.C.Toillustratetherelationshipbetweenprecipitationandagriculturalyield.D.Tocalculatetheexactpopulationdecline.5.Theword"rigid"inthepassageisclosestinmeaningto:A.FlexibleB.StrongC.InflexibleD.Complex6.Accordingtoparagraph3,whatevidencesuggeststherewasinternalconflictwithinthecities?A.Theabandonmentofruralareas.B.Thedestructionlayersshowingfireandviolence.C.Thedeclineinwritingandrecord-keeping.D.Thechangeinarchitecturalstyles.7.Whatisthe"systemscollapse"theorymentionedinparagraph4?A.Theideathattradenetworkscausedthecollapsebyspreadingdisease.B.Thetheorythatindependentsystemsfailedsimultaneouslybycoincidence.C.Theconceptthateconomicinterdependencecausedfailurestospreadacrossregions.D.Thebeliefthatthecollapsewasduetothefailureofasinglecentralgovernment.8.Theword"exploited"inthepassageisclosestinmeaningto:A.TookadvantageofB.DiscoveredC.AttackedD.Rebuilt9.Lookatthefoursquares[■]thatindicatewherethefollowingsentencecouldbeaddedtothepassage."Thisrelianceonexternalresourcescreatedadangerousdependency."Wherewouldthesentencebestfit?A.TheEarlyBronzeAgesawtheriseoflong-distancetradeinluxurygoodslikelapislazuli,metals,andtextiles.[■]Whilethistradebroughtwealth,italsocreatedeconomicinterdependence.[■]Ifonemajornodeinthenetworkfailedduetodroughtorinternalstrife,theeconomicrepercussionscouldrippleoutward,causingshortagesandinstabilityindistantregions.[■]This"systemscollapse"theorysuggeststhatthefragilityofthecomplexeconomicandpoliticaltiesmadetheentirecivilizationvulnerabletoacascadingfailure.[■]B.(Placementlogicsuggestsafterthefirstsentenceoftheparagraphregardingtrade).10.Directions:Anintroductorysentenceforabriefsummaryofthepassageisprovidedbelow.CompletethesummarybyselectingtheTHREEanswerchoicesthatexpressthemostimportantideasinthepassage.Somesentencesdonotbelonginthesummarybecausetheyexpressideasthatarenotpresentedinthepassageorareminorideasinthepassage.ThecollapseofEarlyBronzeAgecitiesaround2200B.C.wasacomplexphenomenon.A.Climaticchanges,particularlyaseveredrought,mayhaveunderminedagriculturalbases.B.Internalsocialstructuresweretoorigidtoadapttoresourcescarcity,causingunrest.C.Theinventionofironweaponsallowednomadicgroupstoconquerthecitieseasily.D.Tradenetworkslinkedregionssocloselythatfailureinoneareacausedinstabilityinothers.E.Thecollapsewascausedbyasuddenvolcaniceruptionthatblockedthesun.F.Citieswereabandonedbecausetheinhabitantsdecidedtoreturntoahunter-gathererlifestyle.Passage2TheEvolutionofPhotographyinthe19thCenturyTheinventionofphotographyintheearly19thcenturywasnotmerelyatechnologicalbreakthrough;itwasaprofoundculturalshiftthatalteredthewaypeopleperceivedrealityandmemory.Beforephotography,visualrepresentationwasthedomainofartistswhointerpretedtheworldthroughpaintinganddrawing.Photographyintroducedamechanicalobjectiveeye,promisinga"truth"thatthehumanhandcouldnotreplicate.However,thepathfromthefirstcrudeimagestothewidespreadsnapshotofthe20thcenturywasfraughtwithtechnicalchallengesandartisticdebates.Thefirstsuccessfulphotographicprocess,thedaguerreotype,wasintroducedbyLouisDaguerrein1839.Thedaguerreotypeproducedasharp,detailedimageonasilveredcopperplate,butithadsignificantlimitations.Eachimagewasuniqueandcouldnotbereproduced;therewerenonegatives.Furthermore,theexposuretimewasinitiallyquitelong,requiringsitterstoremainperfectlystillforseveralminutes.Thismadeportraituredifficultandoftenresultedinstiff,unnaturalposes.Despitethesedrawbacks,thepublicwasfascinatedbytheuncannydetailthedaguerreotypecaptured."Themirrorwithamemory,"asitwascalled,becameaninstantsensation,particularlyforthemiddleclasswhocouldnowaffordalikenessofthemselves,albeitanexpensiveone.Contemporaneously,WilliamHenryFoxTalbotwasdevelopingthecalotypeprocessinEngland.Unlikethedaguerreotype,thecalotypeusedpapernegatives,whichallowedformultiplepositiveprintstobemadefromasingleimage.Thisreproducibilitywascrucialforthedisseminationofphotography.However,becausetheimagewastransferredthroughthefibersofthepaper,calotypeslackedthecrispdetailofthemetal-baseddaguerreotype.Theyhadasofter,almostetherealqualitythatsomeartistsfoundappealing,butwhichthegeneralpublicoftenregardedasinferiorduetothelackofsharpness.Thisdichotomydefinedearlyphotography:thedaguerreotypeoffereddetailbutnocopies;thecalotypeofferedcopiesbutlessdetail.Theturningpointcamein1851withtheintroductionofthewet-collodionprocessbyFrederickScottArcher.Thismethodcombinedthebestofbothworlds:itproducedsharp,detailednegativesonglassthatcouldbeusedtomakeanunlimitednumberofpaperprints.Theresolutionwassuperiortobothpreviousmethods.Thecatch,however,wasconvenience.Photographershadtocoattheglassplatewithcollodion,sensitizeitinsilvernitrate,exposeit,anddevelopit—allwhiletheplatewasstillwet.Thismeantthatalandscapephotographerneededtocarryaportabledarkroomtentwherevertheywent.Thelogisticalburdenwasimmense,yetthequalityoftheimageswassohighthatthewet-collodionprocessdominatedthefieldfornearlythirtyyears.Thefinalstepinmakingphotographyaccessibletothemasseswastheintroductionofdryplatesand,eventually,rollfilm.GeorgeEastman'sKodakcamera,releasedin1888,famouslycamepre-loadedwithrollfilmcapableoftaking100exposures.Theslogan"Youpressthebutton,wedotherest"encapsulatedthedemocratizationofthemedium.Photographywasnolongerthedomainofprofessionalsordedicatedamateurswithchemistrysets;itbecameapartofeverydaylife.Thisshiftallowedfortheriseofsnapshotphotographyandthecandiddocumentationoffamilylife,travel,andcurrenteventsinwaysthathadpreviouslybeenimpossible.Theartisticstatusofphotographywasalsodebatedthroughoutthecentury.Puristsarguedthatbecausethecamerawasamachine,theproductwasmechanicalart,notfineart.Photographersrespondedbymimickingthecompositionandsubjectsofacademicpainting,leadingtothemovementknownasPictorialism.Theyusedsoftfocus,specialfilters,andmanipulationtechniquestomakephotographslookmorelikepaintings.Itwasnotuntilthe20thcenturythatphotographersbegantoembracetheuniquequalitiesofthemedium—itsabilitytocapturethedecisivemomentandtheintrinsicsharpnessofthelens—asvalidartisticexpressionsintheirownright.Questions:1.Accordingtoparagraph1,howdidphotographydifferfrompaintingbeforeitsinvention?A.Itwasfasterandcheapertoproduce.B.Itwasconsideredamechanicalobjectiverecordratherthananinterpretation.C.Itwasonlyusedforscientificpurposes.D.Itrequiredmoreartisticskilltooperate.2.Theword"domain"inthepassageisclosestinmeaningto:A.ControlB.AreaC.HomeD.System3.Whydoestheauthormention"Themirrorwithamemory"inparagraph2?A.Todescribethereflectivesurfaceofthedaguerreotypeplate.B.Toemphasizetherealisticdetailandabilitytorecordthepast.C.Tocriticizethevanityofthemiddleclass.D.Toexplainthelongexposuretimesrequired.4.Whichofthefollowingisalimitationofthedaguerreotypementionedinparagraph2?A.Theimageswerefuzzyandlackeddetail.B.Thechemicalsusedwerehighlytoxic.C.Eachimagewasuniqueandcouldnotbereproduced.D.Theprocesswastoofasttocapturemovingobjects.5.Accordingtoparagraph3,whatwasthemainadvantageofthecalotypeoverthedaguerreotype?A.Itproducedsharperimages.B.Itallowedformultipleprintsfromasinglenegative.C.Ithadashorterexposuretime.D.Itusedmetalplateswhichweremoredurable.6.Theword"dichotomy"inthepassageisclosestinmeaningto:A.CombinationB.DivisionintotwooppositesC.SimilarityD.Problem7.Whywasthewet-collodionprocessdifficultforlandscapephotographers(paragraph4)?A.Thecamerawastooheavytocarry.B.Theglassplatesweretoofragiletotransport.C.Theyhadtoprocesstheplatesimmediatelywhilestillwet.D.Theexposuretimerequiredbrightsunlightwhichwasrare.8.HowdidtheKodakcamerachangephotographyin1888(paragraph5)?A.Itimprovedthesharpnessoftheimagessignificantly.B.Itallowedprofessionalphotographerstotakemorepictures.C.Itmadephotographyaccessibletonon-professionalsbysimplifyingtheprocess.D.Itintroducedcolorphotographyforthefirsttime.9.Accordingtoparagraph6,howdidPictorialistphotographersattempttogainartisticacceptancefortheirwork?A.Byfocusingonscientificaccuracy.B.Bymakingtheirphotographslooklikepaintings.C.Bydocumentingharshsocialrealities.D.Byusingthelatestdigitaltechnology.10.Theword"encapsulates"inthepassageisclosestinmeaningto:A.HidesB.SummarizesC.ComplicatesD.IgnoresPassage3AnimalBehavior:AltruismandKinSelectionInthebiologicalsciences,altruismreferstobehaviorbyanindividualthatincreasesthefitnessofanotherindividualwhiledecreasingthefitnessoftheactor.Atfirstglance,altruismseemstocontradicttheprinciplesofnaturalselectionandDarwinianevolution,whichsuggestthatorganismsacttomaximizetheirownsurvivalandreproductivesuccess.Whywouldasquirrel,forexample,giveanalarmcalluponspottingapredator,therebydrawingattentiontoitselfandincreasingitsownriskofdeath,whileallowingitsrelativestoescape?Theresolutiontothisevolutionarypuzzleliesintheconceptofinclusivefitnessandkinselection.Thetheoryofkinselection,formalizedbyW.D.Hamiltonin1964,proposesthatgenescancauseindividualstoactaltruisticallytowardotherswhocarrythosesamegenes.Sincerelativesshareaproportionoftheirgenesbyvirtueofcommondescent,aidingarelativehelpsensurethesurvivalofcopiesofthealtruist'sowngenes.Hamilton'sRulequantifiesthiscondition.ItstatesthataltruismisfavoredwhenrB>C,whereristhegeneticcoefficientofrelationship(theprobabilitythattwoindividualsshareaparticulargenebydescent),BForexample,inapopulationofground-nestingbirds,afemalemightstayatthenesttoprotectitwhilehersiblingsgoouttoforage.Ifshediesprotectingthenest,shelosesherownpotentialforfuturereproduction(C).However,bysavingthenest,sheensuresthesurvivalofherniecesandnephews.Sincefullsiblingsshare,onaverage,50%oftheirgenes(r=0.5),andnieces/nephewsshare25%(r=0.25),thegeneticgain(Eusocialinsects,suchasants,bees,andwasps,representtheextremeofthisphenomenon.Inthesespecies,asterilecasteofworkersdedicatesitsentirelifetoservingthequeenandraisingheroffspring,oftenforegoingtheirownreproductionentirely.Thisuniquesystemisexplainedbythehaplodiploidsex-determinationsystemfoundinHymenoptera.Inthissystem,femalesdevelopfromfertilizedeggs(diploid)andhavetwosetsofchromosomes,whilemalesdevelopfromunfertilizedeggs(haploid)andhaveonlyoneset.Consequently,afemaleshares50%ofhergeneswithhermother(thequeen)but75%ofhergeneswithherfullsisters.Becausesheismorecloselyrelatedtohersistersthanshewouldbetoherownoffspring(whichwouldonlyshare50%ofhergenes),itisgeneticallyadvantageousforhertoactasaworkerandhelpthequeenproducemoresistersratherthantoproduceherowndaughters.Thisgeneticquirkcreatesastrongbiastowardaltruismwithinthecolony.However,kinselectiondoesnotexplainallformsofaltruismobservedinnature.Reciprocalaltruismisanothermechanismwhereunrelatedindividualshelpeachotherwiththeexpectationthatthefavorwillbereturnedinthefuture.Thisrequirescognitiveabilitiestorecognizeindividualsandrememberpastinteractions.Vampirebats,forinstance,regurgitatebloodtofeedunrelatedroost-mateswhohavefailedtofindameal.Thebatsrememberwhohassharedwiththeminthepastandarelikelytorefusehelptothosewhohavebeengreedy.This"youscratchmyback,I'llscratchyours"systemreliesonrepeatedinteractionsandtheabilitytodetectcheaters.Ultimately,whatappearstobeself-sacrificeinnatureisoftenasophisticatedgeneticstrategy.Byassistingrelativesortradingfavorswithnon-relatives,animalscanindirectlyenhancetheirowngeneticlegacy.Thesebehaviorsdemonstratethatevolutionoperatesnotjustontheindividual,butonthegenestheycarry,favoringstrategiesthatmaximizegenepropagationregardlessofwhichbodyhousesthem.Questions:1.Theword"fitness"inthepassageisclosestinmeaningto:A.PhysicalhealthB.AbilitytosurviveandreproduceC.StrengthD.Speed2.Accordingtoparagraph2,whatisthemainideabehindkinselection?A.Animalsactaltruisticallytoensurethesurvivalofthespecies.B.Animalshelpothersbecausetheyhavebeentaughttodoso.C.Altruismhelpsanindividualpassonitsgenesbyaidingrelativeswhosharethosegenes.D.Altruismisamaladaptivetraitthatshouldbeeliminatedbynaturalselection.3.AccordingtoHamilton'sRule(rBA.Thecosttotheactorislow.B.Thebenefittotherecipientishigh.C.Thegeneticrelatednesstimesthebenefitisgreaterthanthecost.D.Thegeneticrelatednessisgreaterthanthebenefit.4.Whydoestheauthordiscussground-nestingbirdsinparagraph3?A.ToprovideaspecificexampleofhowHamilton'sRuleapplies.B.Toshowthatbirdsaremoreintelligentthanotheranimals.C.Toarguethatbirdsdonotexhibittruealtruism.D.Toexplainthedangersofground-nesting.5.Theword"foregoing"inthepassageisclosestinmeaningto:A.PlanningforB.IncreasingC.GivingupD.Delaying6.Whatisuniqueaboutthegeneticrelationshipoffemalebees(paragraph4)?A.Theyshare100%oftheirgeneswiththequeen.B.Theyaremorecloselyrelatedtotheirsistersthantotheirownoffspring.C.Theyaregeneticallyidenticaltotheirbrothers.D.Theydonotshareanygeneswiththequeen.7.Theword"quirk"inthepassageisclosestinmeaningto:A.ProblemB.FeatureC.ImitationD.Rule8.Howdoesreciprocalaltruismdifferfromkinselection(paragraph5)?A.Itoccursonlybetweencloserelatives.B.Itrequirestheexpectationofareturnfavor.C.Itisbasedonhaplodiploidy.D.Itdoesnotinvolveanycosttotheactor.9.Whatmustvampirebatsbeabletodoforreciprocalaltruismtowork?A.Recognizeindividualbatsandrememberpastinteractions.B.Flylongdistancestofindfood.C.Communicatewithcomplexvocalizations.D.Haplodiploidsexdetermination.10.Theauthor'smainpurposeinthepassageisto:A.CritiqueDarwin'stheoryofnaturalselection.B.Explaintheevolutionarybasisforaltruisticbehaviorinanimals.C.Comparetheintelligenceofmammalsandinsects.D.Describethesocialstructureofantcolonies.第二部分：听力Conversation1Professor:Hi,Sarah,comein.Youwantedtotalkaboutyourproposalforthehistorypaper?Student:Yes,ProfessorMiller.I’mthinkingofwritingabouttheimpactoftherailroadsonthesettlementoftheAmericanWestinthe19thcentury.ButI’mworrieditmightbetoobroadofatopic.Professor:Itisabitbroad,yes.Theimpactofrailroadscoverseverythingfromeconomicstodemographicstotheenvironment.You’dneedtonarrowitdownsignificantlytowriteacoherentpaperinthissemester.Haveyouconsideredfocusingonaspecificaspectoraspecificregion?Student:Iwasthinkingmaybefocusingonthecattleindustry.LikehowtherailroadsallowedcattletobetransportedfromTexastothemarketsintheEast.Professor:That’sbetter.Buteventhen,"thecattleindustry"isquitelarge.Maybeyoucouldlookataspecifictownoraspecific"cowtown"thatboomedbecauseoftherailroadandthenmaybebustwhentheraillinesmovedfurtherwest?PlaceslikeAbileneorDodgeCity.Student:Thatsoundsinteresting.So,lookattheeconomicriseandfallofaspecifictownlinkedtotherailroadexpansion?Professor:Exactly.Youcouldexaminehowthetown'seconomyshifted,thedemographicsofthepeoplemovingin,andthesocialchangesthatcamewiththetemporaryboom.It’sagreatwaytomakealargetopicmanageable.You’llfindplentyofprimarysources,likenewspapersandcityrecordsfromthosetowns.Student:Thatsoundsperfect.IthinkI’llfocusonDodgeCity.I’vereadabitaboutitalready.Professor:Goodchoice.Justmakesuretofocusonthetransitionperiod,notjustthecowboyfolklore.Wewantananalysisofthestructuralchanges,notjustastoryaboutgunfights.Student:Understood.Thanks,Professor.Questions:1.Whatisthestudent'sinitialproblem?A.Shecannotfindenoughsourcesontherailroads.B.Shethinksherchosentopicistoobroad.C.Shedoesnotunderstandtheassignmentrequirements.D.ShewantstochangehermajortoHistory.2.Whattopicdoestheprofessorsuggestthestudentfocuson?A.Theenvironmentalimpactofrailroads.B.Thetechnicalengineeringoftraintracks.C.Theeconomicriseandfallofaspecific"cowtown."D.Thebiographyofafamousrailroadtycoon.3.WhydoestheprofessorsuggestDodgeCity?A.Itistheonlytownwithavailablerecords.B.Itservesasagoodexampleofaboom-and-bustcyclelinkedtorailroads.C.ItwasthefirstrailroadstationinAmerica.D.Thestudentisoriginallyfromthere.4.Whatdoestheprofessorwarnthestudenttoavoid?A.Usingprimarysources.B.Focusingtoomuchoncowboyfolklore.C.Analyzingeconomicdata.D.Writingaboutthetransitionperiod.Lecture1Professor:Todaywe’regoingtodiscussGlacialLakeOutburstFloods,orGLOFs.Asyouknow,duringthelastIceAge,muchofNorthAmericawascoveredbymassiveglaciers.Astheseglaciersbegantoretreatandmelt,theyoftenleftbehindlargelakesdammedupbyiceormoraines—pilesofrockandsedimentdepositedbytheglacier.Sometimes,theseicedamswouldfailcatastrophically.Thewatertrappedbehindthedam,sometimesholdingasmuchwaterasseveralGreatLakescombined,wouldbereleasedsuddenly.Theresultingfloodwouldbeunimaginableinscaleandpower.OneofthemostfamousexamplesistheMissoulaFloods.So,imagineanicedamholdingbackGlacialLakeMissoulainwhatisnowMontana.Thewaterlevelkeptrisingastheicemelted,puttingimmensepressureonthedam.Eventually,thewaterwouldfloattheicedamorcauseittofracture.Oncethedambroke,thewaterrushedoutatspeedsexceeding60milesperhour.Thevolumeofwaterwassotremendousthatitfundamentallyalteredthelandscape.ThefloodwaterscarvedouttheScablandsineasternWashington—aregioncharacterizedbydeepcanyons,drywaterfalls,andmassiveripplesmarks.Theseripplesmarksarehuge,someastallasahouse,formedbytheturbulentwaterswirlingaroundobstacles.Howdoweknowthesefeatureswerecausedbycatastrophicfloodsratherthanslowerosionbyriversovertime?Well,thescaleisoneclue.Theripplesaretoobigfornormalriverflow.Also,wefoundgiant"erratics"—hugebouldersthatweretransportedhundredsofmilesfromtheirsource.Anormalrivercouldn'tmoveaboulderweighingthousandsoftons.Onlyafloodofthismagnitudecouldhavethatmuchkineticenergy.TheforceofthewatercanbecalculatedusingthefluiddynamicsforceequationF=ρA,whereρisthedensityofwater,visthevelocity,andAisthearea.WhenvThesefloodsdidn'tjusthappenonce;geologicalevidencesuggeststheyhappenedrepeatedly,perhapsdozensoftimes,astheicedamwouldreformandthenbreakagainoveraperiodofacoupleofthousandyears.Itcompletelychangedthedrainagepatternsoftheregion,ultimatelyhelpingtoformtheColumbiaRiverGorgethatweseetoday.Questions:1.Whatisthemaintopicofthelecture?A.TheformationoftheGreatLakes.B.ThecausesofthelastIceAge.C.GlacialLakeOutburstFloodsandtheireffects.D.Thetechniquesusedfordatinggeologicalformations.2.Accordingtotheprofessor,whatcausedthewaterfromGlacialLakeMissoulatobereleased?A.Aslowincreaseinrainfall.B.Theicedamfloatingorfracturingduetopressure.C.Humansbreakingthedamtoirrigateland.D.Anearthquakeopeningacrackintheearth.3.Whatarethe"ripplesmarks"mentionedinthelecture?A.Smallwavesonthesurfaceofthecurrentlake.B.Sedimentdepositsatthebottomoftheocean.C.Giantformationscreatedbyturbulentfloodwaters.D.Fossilizedremainsofancientseacreatures.4.Whydoestheprofessormention"erratics"?A.Toexplainhowglaciersmoverocksslowly.B.Toprovethatthewatermovedwithenoughforcetocarryheavyboulders.C.Toshowthattheregionwasonceunderanocean.D.ToillustratethetypeofvegetationthatexistedduringtheIceAge.5.WhatdoestheformulaF=A.Thevolumeofwaterinthelake.B.Theforceexertedbythemovingwater.C.Theageofthegeologicalformations.D.Thetemperatureoftheglacier.6.WhatdoestheprofessorimplyabouttheScablands?A.Theywereformedbyvolcanicactivity.B.Theywerecreatedslowlyovermillionsofyears.C.Theyaretheresultofrepeatedcatastrophicflooding.D.Theyareunsuitableforagriculture.Lecture2Professor:We’vebeentalkingaboutmarketingstrategies.Today,Iwanttointroduceaconceptcalled"SensoryMarketing."Traditionalmarketingfocusesheavilyonvisualandauditorystimuli—TVcommercials,billboards,radiojingles.Buthumansperceivetheworldthroughallfivesenses,andmarketersarestartingtorealizethatengagingsmell,touch,andtastecanbeincrediblypowerfulininfluenci