2026年托福听力学术讲座（生物类）试题：生物进化与人类起源解析

2026年托福听力学术讲座（生物类）试题：生物进化与人类起源解析考试时间：______分钟总分：______分姓名：______Section1(1)ProfessorDavisisdiscussingthefossilrecordofearlyhominins.Shementionsthatoneofthekeydebatesrevolvesaroundthetimelineofwhenbipedalismevolved.Oneresearcherproposedthatbipedalismappearedmuchearlierthanpreviouslythought,basedoncertainfoot骨化石.However,thishypothesisischallengedbythelackofcorrespondingskeletalevidencesuggestingthenecessarymuscleadaptationsforbipedalismatthattime.Theprofessornotesthatwhiletheseearlyfootbonesaresignificant,theymightrepresentadifferentlineagethatdidn'tsurvivelong-term,ortheadaptationsmightnothavebeenfullydevelopedforuprightwalking.(2)Astudentaskstheprofessoraboutthetoolsassociatedwithearlyhumanancestors.Theprofessorexplainsthattheearliesttoolsfound,likethoseatOlduvaiGorge,arequitesimple,consistingmainlyofchippedstonesusedforcuttingorpounding.Shepointsoutthatthesetoolsdon'tshowalotofstandardization,suggestingthattheirusewasperhapsmoreexperimentalorforspecific,limitedtasks.TheprofessorcontraststhesewithlaterAcheuleantools,whicharemoresophisticatedandstandardized,indicatingmorecomplexcognitiveabilitiesandpotentiallybetterteachingoftool-makingskillswithingroups.(3)Theprofessorisexplaininggeneticevidencerelatedtohumanevolution.Shetalksabouttheconceptofa"geneticbottleneck,"apointinhumanhistorywherethehumanpopulationsizedrasticallyreduced,leadingtoalossofgeneticdiversity.Shementionsthatevidenceforthisbottleneckcomesfromcomparingthegeneticvariationfoundinmodernhumanpopulationsworldwide.PopulationsinAfricashowsignificantlymoregeneticdiversitythanthoseinotherpartsoftheworld,supportingtheideathatmodernhumansoriginatedinAfricaandthenmigratedout,passingthroughthisbottleneck.Section2(4)Inalectureonplantadaptation,theprofessordiscussesdesertenvironments.Sheexplainsthatplantslivingindesertsfaceextremechallenges,primarilywaterscarcityandintensesunlight.Onekeyadaptationisthedevelopmentofextensiverootsystemstoabsorbasmuchwateraspossible,sometimesextendingfarbeyondthereachoftheabove-groundvegetation.Anothercrucialadaptationisthepresenceoffeatureslikethick,fleshyleavesorstems,knownassucculence,whichallowtheplanttostorewater.Additionally,manydesertplantshavesmallornoleavestominimizewaterlossthroughtranspiration.(5)Theprofessorisdescribinghowevolutionarypressurescanleadtospeciation.SheusestheexampleofDarwin'sfinchesintheGalápagosIslands.Sheexplainsthatthesefinchesdescendedfromacommonancestorthatarrivedontheislands.Differentislandspresenteddifferentenvironmentalconditions,particularlyvaryingtypesoffoodsourceslikeseeds,insects,andcactusfruits.Overtime,naturalselectionfavoreddifferentbeakshapesandsizesbettersuitedfordifferentfoodsondifferentislands.Thisledtothedivergenceofseveraldistinctspecies,eachadaptedtoaspecificniche.(6)Astudentquestionstheprofessoraboutthespeedofevolutionarychange.Theprofessorclarifiesthatevolutioncanoccuratdifferentratesdependingontheenvironmentalpressureandthegeneticvariabilitywithinapopulation.Shegivestheexampleofbacteriadevelopingantibioticresistance.Thisevolutioncanhappenrelativelyquickly,sometimeswithinafewgenerations,becausebacteriareproducerapidlyandthere'ssignificantgeneticvariationduetomutations.Shecontraststhiswiththeevolutionofcomplextraitsinmammals,whichoftenrequiresmuchlongerperiodsandinvolvesmultiplegenesinteracting,makingtheprocessappearslowerfromahumanperspective.(7)Thelectureturnstothetopicofmigrationanditsimpactonhumancultures.TheprofessordiscussesthepeoplingoftheAmericas,explainingthatthecurrentconsensusisthatthefirsthumansarrivedviatheBeringLandBridgeduringaperiodoflowersealevels.ShenotesthattheseearlymigrantslikelyhadtoadapttodiverseenvironmentsastheymovedsouthwardintotheAmericas.Theprofessormentionsthatarchaeologicalevidence,suchaschangesintooltypesandsettlementpatterns,showstheseadaptationsovertime.Shealsopointsoutthatthedifferentenvironmentslikelycontributedtothedevelopmentofdistinctculturalpracticesandknowledgesystemsamongvariousindigenousgroups.(8)Theprofessorisexplainingtheconceptofconvergentevolution.Shegivestheexampleofsharksanddolphins.Despitebeingfromentirelydifferentclassesofanimals(fishandmammals,respectively),bothhaveevolvedasimilarbodyshapeandstreamliningforefficientmovementthroughwater.Theprofessorexplainsthatthissimilarappearanceisduetobothspeciesfacingthesameenvironmentalpressureintheiraquatichabitatandadaptinginasimilarway.Sheemphasizesthatalthoughtheirbodyshapesaresimilar,theirinternalanatomy,breathingapparatus,andevolutionaryoriginsarefundamentallydifferent,highlightingthatsimilarfunctionscanevolveindependently.试卷答案(1)J(Thelecturediscussesadebateaboutthetimelineofbipedalism,mentioningearlyfootbonesfoundbyoneresearcherandthelackofevidencefornecessaryskeletaladaptationsatthattime.Thisalignswiththetranscriptwheretheprofessortalksaboutearlyfootbonesandthechallengestothehypothesisofearlybipedalismduetolackofcorrespondingskeletalevidence.)(2)G(Thelecturementionstheearliesttools(OlduvaiGorge)weresimplechippedstones,notverystandardized,suggestingexperimentalorlimiteduse.Thismatchesthetranscriptwheretheprofessordescribestheseearlytoolsassimple,non-standardized,andperhapsexperimental.)(3)K(Thelecturediscussesgeneticevidenceforahumanbottleneck,mentioninglowergeneticdiversityoutsideAfricacomparedtoAfrica,supportingthe"outofAfrica"theoryandtheconceptofabottleneckpassedthroughbymigratinghumans.ThiscorrespondswiththetranscriptexplaininggeneticdiversitydifferencesandlinkingthemtothebottlenecktheoryandAfricanorigin.)(4)H(Thelecturedescribesadaptationsindesertplantstoconservewater,mentioningextensiverootsystemstoabsorbwaterandthick,fleshyleavesorstems(succulence)tostorewater.Thismatchesthetranscriptwhichdescribesrootsystemsextendingfarandsucculentfeaturesforwaterstorageasadaptationstowaterscarcity.)(5)F(ThelectureusesDarwin'sfinchesasanexampleofspeciationduetodifferentenvironmentalpressures(foodsources)ondifferentislandsleadingtonaturalselectionfavoringdifferentbeakshapesadaptedtospecificniches.Thisalignswiththetranscriptdescribingfinchesevolvingdifferentbeaksizes/shapesbasedonfoodavailabilityondifferentislandsasanexampleofadaptiveradiationandspeciation.)(6)A(Thelectureaddressesthequestionofevolutionaryspeed,givingtheexampleofbacteriadevelopingantibioticresistancequicklyduetorapidreproductionandhighgeneticvariation,contrastingthiswiththeslowerevolutionofcomplextraitsinmammals.Thismatchesthetranscriptwheretheprofessorexplainsdifferentratesofevolutionbasedonfactorslikereproductionspeedandgeneticvariation,usingbacteriaasanexampleofquickevolution.)(7)D(ThelecturediscussesthepeoplingoftheAmericas,mentioningtheBeringLandBridgetheory