2026年托福听力学术讲座（生物类）试题：生物技术与食品科学解析

2026年托福听力学术讲座（生物类）试题：生物技术与食品科学解析考试时间：______分钟总分：______分姓名：______Section1(1)ProfessorChenisdiscussinggeneticmodificationinagriculture.Shementionsthattraditionalbreedingmethodscantakemanyyearstodevelopaplantwithdesiredtraits,likedroughtresistance.SheintroducesCRISPR-Cas9technologyasafaster,moreprecisealternative.TheprofessorexplainsthatCRISPRallowsscientiststoedittheplant'sDNAdirectly,targetingspecificgenesresponsiblefortraitssuchasyieldornutrientcontent.ShenotesthatthistechnologyhasalreadybeenusedtocreatericevarietieswithhighervitaminAlevels,whichcanhelpcombatmalnutritioninsomeregions.However,shealsopointsoutapotentialconcern:thelong-termecologicalimpactofintroducinggeneticallymodifiedplantsintowildecosystemsisnotyetfullyunderstood.(2)Theconversationtakesplacebetweenastudent,Maya,andProfessorRodriguez,whoteachesfoodscience.Mayaisaskingforhelpwithhertermpaper.Sheisinterestedinthetopicofalternativeproteinsources.ProfessorRodriguezexplainsthatthedemandforproteinisincreasingglobally,puttingpressureontraditionalanimalagriculture.Hementionstwomaincategoriesofalternativeproteins:plant-basedproteins,likealmondmilkorsoyburgers,whichhavebeenonthemarketforawhile,andcultivatedorlab-grownproteins,whicharemoreexperimental.Hesayscultivatedproteinsaremadebygrowingmusclecells(oftenfromasmalltissuesampleofananimal)inabioreactor,mimickingtheanimalgrowthprocessbutwithouttheanimalitself.Mayaissurprisedbythetechnologyandasksifittastesandlookslikemeat.ProfessorRodriguezconfirmsthatthetextureandflavorareconstantlybeingimprovedbutadmitsit'sstilldifferentfromconventionalmeatforsomepeople.(3)Inthelecture,thespeaker,Dr.Evans,isdiscussingfoodpreservationtechniques.Hebeginsbyexplainingthattraditionalmethodslikedrying,salting,andsmokingweredevelopedtopreventspoilagebyinhibitingmicrobialgrowth.Hethenfocusesonmoderntechniques,startingwithrefrigerationandfreezing,whichslowdownmetabolicratesbutdon'teliminatebacteria.Dr.Evansmovesontodiscusschemicalpreservatives,suchassulfitesandnitrates,whichinhibitmicrobialgrowthbutraiseconcernsaboutpotentialhealtheffectsathighlevels.Hethenintroduceshigh-pressureprocessing(HPP)asanon-thermalmethodthatinactivatesmicroorganismsbysubjectingfoodtoextremelyhighpressure.ThespeakerhighlightsHPP'sadvantageofpreservingthefood'soriginalcolor,texture,andnutritionalcontentwithouttheneedforheatorchemicaladditives,althoughhenotesthatitrequiresspecializedequipmentandcanbemoreexpensive.Section2(4)ProfessorLeeistalkingabouttheroleofprobioticsinhumanhealth.Shestartsbydefiningprobioticsasbeneficialbacteriathat,whenconsumedinadequateamounts,canimproveguthealth.Sheexplainsthatthehumangutmicrobiomeisincrediblycomplex,containingtrillionsofmicroorganismsthatplayacrucialroleindigestion,immunefunction,andevenmentalhealth.Theprofessordiscusseshowfactorslikediet,antibiotics,andlifestylecandisruptthegutmicrobiomebalance,leadingtovarioushealthissues.Shethenfocusesonspecificprobioticstrains,mentioning*LactobacillusrhamnosusGG*and*Bifidobacteriumbifidum*,whichhavebeenstudiedfortheirpotentialbenefitsinpreventingortreatingconditionslikeirritablebowelsyndrome(IBS)andcertaintypesofdiarrhea.However,shewarnsthatnotallprobioticsareeffective,andtheirspecificbenefitsoftendependontheindividualandtheconditionbeingtreated.(5)Theconversationisbetweentwostudents,BenandChloe,intheirorganicchemistrylab.BenisshowingChloeastrangereactionhegotwhiletryingtosynthesizeanewfoodadditive.Theadditiveissupposedtobeapotentantioxidant,butBen'sproducthasadifferentcolorandseemstohavealowerpuritythanexpected.Chloesuggeststheymighthavehadanerrorinthepurificationstep,perhapsusingthewrongsolvent.Benagreesthat'sapossibilitybutmentionshedouble-checkedthelabmanualandfollowedtheprocedureprecisely.Theyconsiderrunningthesynthesisagain,buttimeisrunningoutbeforetheirdeadline.Chloethenproposesanotheridea:"Whatifthestartingmaterialwasn'tpure?Sometimesthesuppliersendsimpurecompounds,especiallyforcheaperchemicals."Benhadn'tthoughtofthat,andtheydecidetocheckthepurityoftheirstartingmaterialbeforeproceedingwithanotherreaction.(6)Thelecturecoverstheethicalconsiderationssurroundinggeneticallymodifiedorganisms(GMOs)infood.TheprofessorbeginsbydefiningGMOsandexplaininghowtheyarecreatedthroughgeneticengineering.Shethenoutlinestheargumentsfromproponents,whoemphasizeGMOs'potentialtoincreasecropyields,enhancenutritionalvalue,andreducetheneedforpesticides,therebycontributingtoglobalfoodsecurity.Theprofessoracknowledgesthesepotentialbenefits.However,shethenshiftsfocustotheconcernsraisedbycritics.Theseincludepotentialunknownlong-termhealtheffects,thepossibilityofGMOscross-pollinatingwithwildplantsandcreating'superweeds',andtheissueofcorporatecontroloverthefoodsupplyduetopatentsheldbybiotechcompanies.ThespeakermentionsthatlabelingGMOfoodsisacontentiousissue,withdebatesoverconsumerrightstoknowversusthepotentialstigmatizationofGMOproducts.SheconcludesbystatingthatwhileGMOtechnologyofferspromisingsolutions,theseethicalandenvironmentalconcernsmustbecarefullymanagedthroughregulationandongoingresearch.(7)ProfessorDaviesisspeakingaboutsustainablefoodproduction.Sheemphasizesthattraditionalagriculturehassignificantenvironmentalimpacts,includingdeforestation,soildegradation,andhighwaterusage.Sheintroducestheconceptofverticalfarmingasanalternativeapproach,particularlysuitableforurbanenvironments.Inverticalfarming,plantsaregrowninlayers,oftenincontrolledenvironmentslikeskyscraper-sizedgreenhouses.Theprofessorexplainskeyfeaturesofthissystem,suchasusingsignificantlylesslandandwaterthanconventionalfarming,year-roundproductionindependentofweather,andreducingtheneedfortransportationbygrowingfoodlocally.Shealsomentionstheuseofartificialintelligenceforoptimizinglight,water,andnutrientdeliverytotheplants.However,shepointsoutthehighinitialsetupcostsandenergyconsumptionassociatedwithverticalfarms,notingthattheirlong-termsustainabilitydependsonadvancementsinenergyefficiencyandrenewableenergyintegration.试卷答案(1)C解析思路：题目可能问教授主要讨论了什么。讲座的核心是介绍CRISPR-Cas9作为传统育种方法的替代品，强调其精确性和速度，并提及了其在提高作物产量和营养价值方面的应用（如富含维生素A的稻米）以及潜在的生态风险。选项C如果概括了CRISPR作为替代方法及其优点和缺点，则符合主旨。(2)D解析思路：题目可能问cultivatedproteins是什么。讲座中明确解释了cultivatedproteins是指通过