全国英语等级考试（PETS）四级练习试题库(2025年下半年贵州铜仁市)

全国英语等级考试（PETS）四级练习试题库(2025年下半年贵州铜仁市)SectionIListeningComprehensionDirections:ThissectionisdesignedtotestyourabilitytounderstandspokenEnglish.Youwillhearaselectionofrecordedmaterialsandyoumustanswerthequestionsthataccompanythem.PartAYouwillhearaconversationbetweenastudentandauniversityprofessor.Listentotheconversationandanswerquestions1to3.Student:ProfessorSmith,Iwantedtodiscussmyresearchmethodologyfortheupcomingthesis.Iamplanningtoinvestigatetheimpactofremoteworkonemployeeproductivityinthetechindustry.Professor:Thatisahighlyrelevanttopic.However,"productivity"isabroadconcept.Howexactlydoyouplantomeasureit?Student:Iwasthinkingofusingself-reportedsurveys,askingemployeestoratetheiroutputlevelsbeforeandafterthetransitiontoremotework.Professor:Self-reporteddatacanbeheavilybiased.Peopletendtooverestimatetheirproductivitywhenworkingfromhome.Haveyouconsideredusingobjectivemetrics,suchasthenumberofcompletedtasksorsoftwareusagelogs?Student:Iseeyourpoint.Butobtainingsoftwarelogsraisesprivacyconcerns,andthenumberofcompletedtasksvariessignificantlyacrossdifferentroles.Professor:Exactly.Thatiswhyyouneedamixed-methodsapproach.Combinequantitativemetricswithqualitativeinterviews.Asforyourformulatocalculatetherelativeproductivityindex,youcouldusesomethinglikeP=,whereistheoutputafterremoteworkandistheoutputbefore.JustremembertodefineOclearlyforeachrole.Student:Thatmakessense.IwillredesignthesurveytoincludeobjectivedatapointsprovidedbytheHRdepartment,ensuringanonymity,ofcourse.Professor:Good.Onceyouhavetherevisedproposalready,sendittomebyFriday.Questions:1.Whatisthemainproblemtheprofessoridentifieswiththestudent'sinitialresearchplan?[A]Thetopicistoobroadandlacksrelevance.[B]Self-reportedsurveyscancontainsignificantbiases.[C]Privacyconcernspreventtheuseofanydata.[D]Thenumberofcompletedtasksisimpossibletomeasure.2.Whatdoestheprofessorsuggesttoimprovetheresearchmethodology?[A]Focusingonlyonsoftwareusagelogs.[B]Abandoningtheprojectandchoosinganewtopic.[C]Adoptingamixed-methodsapproachcombiningquantitativeandqualitativedata.[D]Surveyingonlyemployeesinmanagerialroles.3.Basedontheprofessor'ssuggestion,whatistheformulafortherelativeproductivityindex?[A]P[B]P[C]P[D]PPartBYouwillhearashortlectureabouturbanecology.Listenandanswerquestions4to6.Lecturer:Today,wedelveintotheconceptofurbanecology,specificallyfocusingonthe"urbanheatisland"effect.Thisphenomenonoccurswhenacityexperiencesmuchwarmertemperaturesthannearbyruralareas.Theprimaryreasonforthistemperaturediscrepancyisthemodificationoflandsurfaces.Urbanareasarecharacterizedbyvastexpansesofasphaltandconcrete,materialsthatabsorbandretainsolarradiationmoreefficientlythannaturalvegetation.Furthermore,thelackofevapotranspiration—theprocessbywhichwateristransferredfromthelandtotheatmospherebyevaporationfromthesoilandothersurfacesandbytranspirationfromplants—meansthereislesscooling.Toquantifythiseffect,researchersuseathermalequilibriumequation.Thesurfaceenergybalancecanbeexpressedas=++,whereisthenetall-waveradiation,isthesensibleheatflux,isthelatentheatflux,andistheheatstorage.Inruralareas,ishighduetovegetation,leadingtocooling.Incities,anddominate,leadingtowarming.Mitigationstrategiesincludeincreasinggreenroofs,plantingurbanforests,andutilizingreflectivematerialsonbuildingsurfaces.Questions:4.Accordingtothelecture,whatisthemaincauseoftheurbanheatislandeffect?[A]Increasedgreenhousegasemissionsfromvehicles.[B]Thehighdensityofpopulationgeneratingbodyheat.[C]Modificationoflandsurfaceswithmaterialslikeasphaltandconcrete.[D]Thelackofindustrialzonesinruralareas.5.Whyisevapotranspirationimportantforcoolingtheenvironment?[A]Itgenerateswindthatcoolsthecity.[B]Ittransferswatertotheatmosphere,reducingsurfaceheat.[C]Itblockssolarradiationfromreachingtheground.[D]Itincreasesthesensibleheatflux.6.Inthesurfaceenergybalanceequation=+[A]ishigher,leadingtomorecooling.[B]anddominate,causingtemperaturestorise.[C]issignificantlyreducedduetotallbuildings.[D]becomeszero.PartCYouwillhearanewsreportaboutarecenttechnologicalbreakthrough.Listenandanswerquestions7to10.NewsAnchor:Inagroundbreakingannouncement,ateamofscientistshasdevelopedanewtypeofsolid-statebatterythatcouldrevolutionizetheelectricvehicleindustry.Unliketraditionallithium-ionbatteriesthatuseliquidelectrolytes,thesenewbatteriesemployasolidceramicmatrix.Thisinnovationaddressestwomajorissues:flammabilityandenergydensity.Thesolidelectrolyteisnon-flammable,drasticallyreducingtheriskofvehiclefires.Moreimportantly,theenergydensityhasbeenimprovedsignificantly.Thetheoreticalenergydensitycanbecalculatedusingtheequation=,whereistheenergydensity,isthetotalenergystored,andVisthevolumeofthebattery.Thenewdesignreducestheinternalvolumewastedoncoolingsystemsandsafetystructures,therebyincreasingbynearlyfortypercent.Thismeanselectricvehiclescouldpotentiallytraveluptoonethousandkilometersonasinglecharge,matchingtherangeofconventionalgasoline-poweredcars.Furthermore,thechargingtimehasbeenreducedtounderfifteenminutes.Questions:7.Whatistheprimarycomponentthatdifferentiatesthenewbatteryfromtraditionalones?[A]Itusesaliquidceramicelectrolyte.[B]Itemploysasolidceramicmatrix.[C]Itcompletelyremoveselectrolytes.[D]Itusesahighlyflammableliquid.8.Whatarethetwomajorissuesaddressedbythisnewbatterytechnology?[A]Costandweight.[B]Flammabilityandenergydensity.[C]Chargingtimeandenvironmentalimpact.[D]Durabilityandtemperatureresistance.9.Accordingtotheequation=,howwastheenergydensityincreased?[A]Byincreasingthetotalenergystored()exclusively.[B]Bydecreasingthevolume(V)wastedoncoolingandsafetystructures.[C]Byincreasingthevolume(V)ofthebatterycasing.[D]Byreducingthetotalenergy()tomakethebatterysafer.10.Whatisthepracticalbenefitforelectricvehicleownersmentionedinthereport?[A]Theycantraveluptoonethousandkilometersonasinglecharge.[B]Thebatterieswillbecompletelyfreeofcharge.[C]Thevehicleswillnolongerrequireanycoolingsystems.[D]Thechargingtimeisreducedtounderfiveminutes.SectionIIEnglishKnowledgeUtilizationDirections:Readthefollowingtext.Choosethebestword(s)foreachnumberedblank.Theconceptofcirculareconomyhasgainedimmensetractioninrecentyearsasaviablealternativetothetraditionallineareconomy.Alineareconomyoperatesona"take,make,dispose"modelofproduction,whichisincreasinglyrecognizedasunsustainable.Incontrast,acirculareconomyaimsto11wasteandthecontinualuseofresources.Thiseconomicsystemreliesonsharing,leasing,reusing,repairing,refurbishing,andrecyclingexistingmaterialsandproductsaslongaspossible.Oneofthecoreprinciplesofthissystemisthedecouplingofeconomicactivityfromthe12offiniteresources.Traditionally,economicgrowthhasbeeninextricablylinkedtoincreasedresourceextractionandenvironmental13.Thecirculareconomybreaksthislinkbycreatingaclosed-loopsystem.Insuchasystem,productlifeis14,valuesaremaintainedforaslongaspossible,andwasteisminimized.Whenaproductreachestheendofitslife,itsmaterialsarekeptwithintheeconomywhereverpossible.Thesematerialsare15productively,usedagainandagain,therebycreatingfurthervalue.Implementingacirculareconomyrequiresafundamental16inhowbusinessesoperate.Companiesmusttransitionfromsellingproductstosellingservices.Forinstance,insteadofsellinglightbulbs,acompanymightselllightingasaservice,retainingownershipoftheequipmentandincentivizingthemtocreate17productsthatlastlongerandareeasilyrepairable.Thisshiftnotonlybenefitstheenvironmentbutalsoopensupnewrevenuestreamsandreduceslong-termcostsforbusinesses.Furthermore,thecirculareconomymodel18innovationandjobcreationinareassuchasreverselogistics,remanufacturing,andsustainabledesign.Governmentsplayacrucialroleinfacilitatingthistransitionthrough19policies,suchasextendedproducerresponsibilityschemesandtaxincentivesforcircularbusinessmodels.Ultimately,thetransitiontoacirculareconomyisnotmerelyanenvironmentalnecessitybutacompellingeconomic20thatpromisesresilienceandlong-termprosperity.11.[A]eliminate[B]generate[C]accumulate[D]conceal12.[A]discovery[B]consumption[C]production[D]distribution13.[A]protection[B]conservation[C]degradation[D]restoration14.[A]shortened[B]extended[C]terminated[D]suspended15.[A]wasted[B]discarded[C]cycled[D]isolated16.[A]shift[B]stagnation[C]decline[D]restriction17.[A]fragile[B]durable[C]disposable[D]obsolete18.[A]stifles[B]postpones[C]stimulates[D]complicates19.[A]regulatory[B]restrictive[C]passive[D]ambiguous20.[A]liability[B]burden[C]opportunity[D]expenseSectionIIIReadingComprehensionPartAReadthefollowingtexts.AnswerthequestionsbeloweachtextbychoosingA,B,C,orD.Text1Thehumanmicrobiome,thecomplexcommunityofmicroorganismsresidinginandonthehumanbody,hasemergedasacriticalfactorinregulatingvariousphysiologicalprocesses.Recentresearchhashighlighteditsprofoundimpactonbraindevelopmentandcognitivefunction.Thegut-brainaxis,abidirectionalcommunicationnetworklinkingtheentericnervoussystemoftheguttothecentralnervoussystem,servesastheprimarypathwayforthisinteraction.Studiesongerm-freemicehavedemonstratedthattheabsenceofamicrobiomeleadstoalteredbehaviors,includingincreasedanxietyandimpairedmemoryformation.Whenthesemicewerecolonizedwithnormalgutbacteria,theirbehavioralanomalieswerelargelyreversed.Thissuggeststhatmicrobialmetabolites,suchasshort-chainfattyacids,caninfluenceneuroinflammationandeventheproductionofneurotransmitterslikeserotonin.Inhumans,clinicaltrialsareexploringtheuseofpsychobiotics—livemicroorganismsthat,wheningestedinadequateamounts,producementalhealthbenefits.Whilethefieldisstillinitsinfancy,earlyresultsindicatethatalteringthegutmicrobiotacompositionthroughdiet,probiotics,orfecalmicrobiotatransplantationcouldserveasanadjuncttherapyforconditionslikedepression,anxiety,andevenneurodegenerativediseases.However,researcherscautionthatthemechanismsofactionarehighlycomplexandstrain-specific.Thechallengeliesinidentifyingtheexactstrainsanddosagesrequiredforspecifictherapeuticoutcomes,asaone-size-fits-allapproachisunlikelytosucceed.21.Whatisthemainideaofthefirstparagraph?[A]Thehumanbrainisthemostcomplexorganinthebody.[B]Microorganismsonlyresideinthehumangut.[C]Themicrobiomeplaysacrucialroleinregulatingphysiologicalprocesses,includingbrainfunction.[D]Theentericnervoussystemoperatesindependentlyofthecentralnervoussystem.22.Whatdidthestudiesongerm-freemicereveal?[A]Normalgutbacteriahavenoeffectonbehavior.[B]Theabsenceofamicrobiomecausesbehavioralchangessuchasincreasedanxiety.[C]Short-chainfattyacidsareharmfultomemory.[D]Germ-freemiceareentirelyimmunetoneuroinflammation.23.Howdomicrobialmetabolitespotentiallyaffectthebrainaccordingtothetext?[A]Bydirectlydestroyingbraincells.[B]Bydecreasingtheproductionofserotonin.[C]Byinfluencingneuroinflammationandneurotransmitterproduction.[D]Bycompletelyhaltingtheentericnervoussystem.24.Whatdoestheauthorimplyaboutthecurrentstateofpsychobioticresearch?[A]Itisafullydevelopedfieldwithstandardizedtreatments.[B]Itispromisingbutstillrequiresmoreresearchtoidentifyspecificstrainsanddosages.[C]Ithasproventhatdiethasnoeffectonthemicrobiome.[D]IthasbeendefinitivelyprovenasacureforAlzheimer'sdisease.25.Theword"adjunct"inthethirdparagraphmostlikelymeans:[A]Aprimarycure.[B]Somethingaddedtoanotherthingbutnotessentialtoit.[C]Adangeroussideeffect.[D]Atypeofpathogen.Text2Deepspaceexplorationrequireshighlyreliablepowersourcesthatcanoperatefordecadeswithoutmaintenance.Solarpanelsareeffectiveformissionswithintheinnersolarsystem,butasspacecrafttravelfurtherfromthesun,theintensityofsolarradiationdiminishesaccordingtotheinverse-squarelaw.ThepowergeneratedbyasolarpanelcanbecalculatedusingtheformulaP=,whereisareferencepowerlevel,disthedistancefromthesuninastronomicalunits(AU),andPistheactualpowerreceived.FormissionsbeyondMars,thesolarfluxbecomesinsufficient,makingalternativepowersourcesnecessary.RadioisotopeThermoelectricGenerators(RTGs)havebeenthestandardsolutionfordeepspacemissionslikeVoyagerandCassini.RTGsconverttheheatgeneratedbythenaturalradioactivedecayofPlutonium-238intoelectricitythroughtheSeebeckeffect.Theelectricalpoweroutput(W)canbecalculatedusingtheequationW=η·,whereηisthethermoelectricconversionefficiency,andisthethermalpowerfromthedecayingisotope.Overtime,thethermaloutputoftheisotopedecreasesaccordingtoitshalf-life,andthethermocouplesdegrade,leadingtoagradualdeclineinpoweroutput.Engineersmustpreciselycalculatetheinitialandexpectedη26.Whyaresolarpanelslesseffectivefordeepspacemissions?[A]Theyaretooheavytolaunch.[B]Theintensityofsolarradiationdecreaseswithdistanceaccordingtotheinverse-squarelaw.[C]Theyareeasilydamagedbymicrometeorites.[D]Theyrequiretoomuchmaintenance.27.AccordingtotheformulaP=[A]1/3ofthereferencepower.[B]1/9ofthereferencepower.[C]3timesthereferencepower.[D]9timesthereferencepower.28.WhatistheprimaryfunctionofanRTGinaspacecraft?[A]Toprovidepropulsion.[B]Togenerateelectricityfromsolarradiation.[C]Toconvertradioactivedecayheatintoelectricity.[D]Tocoolthespacecraft'sinstruments.29.IntheformulaW=η·[A]Itremainsconstantforever.[B]Itincreasesastheisotopeheatsup.[C]Itgraduallydeclinesduetoisotopedecayandthermocoupledegradation.[D]Itdropstozeroimmediatelyafterlaunch.30.WhatmustengineerscalculatecarefullywhendesigninganRTGsystem?[A]Theexactcolorofthesolarpanels.[B]Theinitialthermalpowerandexpectedefficiencytoensuresufficientpowerattheendofthemission.[C]Thegravitationalpullofnearbyplanets.[D]Thedistancetotheneareststar.Text3TheconceptofUniversalBasicIncome(UBI)hasmovedfromthefringesofeconomictheorytomainstreampoliticaldiscourse.UBIisaperiodiccashpaymentdeliveredtoallcitizensonanindividualbasis,withoutmeanstestingorworkrequirements.ProponentsarguethatUBIprovidesasafetynetagainstjobdisplacementcausedbyautomationandartificialintelligence.Itisalsopraisedforitspotentialtoeliminatepovertytrapsassociatedwithtraditionalwelfaresystems,wheretakingalow-payingjobcanresultinthelossofbenefits,effectivelyimposingahighmarginaltaxrateonthepoor.However,criticsraisesignificantconcernsregardingtheeconomicfeasibilityofUBI.Theprimaryobjectionisthecost.Providingameaningfulincometoeverycitizenwouldrequiremassivegovernmentexpenditure,necessitatingsubstantialtaxincreases.Opponentsarguethatsuchtaxhikescouldstifleeconomicgrowthanddiscourageinvestment.Furthermore,thereisthebehavioralconcern:willUBIdiscouragelaborparticipation?Ifindividualscansurvivewithoutworking,asignificantportionofthepopulationmightoptoutofthelaborforce,leadingtoadecreaseinoveralleconomicproductivity.Empiricalevidencefrompilotprogramshasbeenmixed.Somestudiessuggestminimalimpactonlaborparticipation,withrecipientsoftenusingthefundsforeducationorchildcare,ultimatelyincreasingtheirfutureearningpotential.Otherstudiesindicateaslightreductioninworkinghours,primarilyamongspecificdemographicslikeyoungmothersandteenagerscontinuingtheireducation.Thedebateultimatelyhingesonatrade-offbetweenthesocialsecurityprovidedbyUBIandthepotentialeconomicdisincentivesitmaycreate.31.Accordingtothetext,whatisoneofthemainargumentsinfavorofUBI?[A]Itencouragespeopletoworklongerhours.[B]Itprovidesasafetynetagainstjobdisplacementfromautomation.[C]Itincreasesthemarginaltaxrateforthepoor.[D]Iteliminatestheneedforeducation.32.Whatisthe"povertytrap"mentionedinthefirstparagraph?[A]Asituationwheretakingalow-payingjobcausesalossofwelfarebenefits.[B]Ageographicalareawithhighpovertyrates.[C]Thehighcostoflivinginurbancenters.[D]Theinabilitytoaccesstraditionalbankingsystems.33.WhatistheprimaryobjectiontoUBIraisedbycritics?[A]Itistoodifficulttoadminister.[B]Itwillcauseimmediatehyperinflation.[C]Themassivecostrequiressubstantialtaxincreases.[D]Itencouragespopulationgrowth.34.WhatdoempiricalstudiesregardingUBIandlaborparticipationsuggest?[A]UBIuniversallyleadstoamassivedropinlaborparticipation.[B]UBIhasabsolutelynoeffectonwhetherpeoplework.[C]Theimpactismixed,withsomeusingfundsforeducationandothersslightlyreducingworkinghours.[D]OnlyteenagersreducetheirworkinghourswhenreceivingUBI.35.Theauthor'stoneinthefinalparagraphcanbestbedescribedas:[A]HighlybiasedagainstUBI.[B]Objectiveandbalanced,presentingatrade-off.[C]ExtremelyenthusiasticaboutUBIimplementation.[D]Indifferenttotheeconomicconsequences.PartBInthefollowingtext,somesentenceshavebeenremoved.ChoosethemostsuitableonefromthelistA-Gtofitintoeachofthenumberedblanks.Thephenomenonofbioluminescence,theproductionandemissionoflightbyalivingorganism,isoneofnature'smostcaptivatingspectacles.Itisawidespreadphenomenon,foundpredominantlyinmarineenvironments,butalsooccurringinterrestrialorganismslikefirefliesandcertainfungi.36.Thisreactioninvolvesalight-emittingmoleculecalledluciferinandanenzymecalledluciferase.Thebiologicalpurposesofbioluminescencearediverse.Forsomeorganisms,itservesasadefensemechanism.37.Othersuselightforpredation.Theanglerfish,forinstance,possessesamodifieddorsalfinthatactsasalure,emittinglighttoattractunsuspectingpreyinthedarkoceandepths.38,actingasabeacontoattractmates.Thechemicalprocessunderlyingbioluminescenceishighlyefficient,withnearlyalltheenergyproducedbeingemittedaslightratherthanheat.Thisefficiencyhasmadethegenesresponsibleforbioluminescencehighlyvaluableinbiotechnology.39,allowingscientiststotracktheexpressionofspecificgenesinreal-time.Furthermore,researchersaredevelopingbioluminescentplantsasasustainablealternativetoelectricstreetlighting,aconceptthatcouldrevolutionizeurbanplanning.40,thepotentialapplicationsarevast,rangingfrommedicaldiagnosticstoenvironmentalmonitoring.[A]Forexample,the"burglaralarm"strategyinvolvesanorganismemittinglighttostartlepredatorsortoattractlargerpredatorstotheoneattackingit.[B]Byinsertingthesegenesintoothercells,suchasbacteriaormammaliancells,researcherscanusetheemittedlightasareporter.[C]Atitscore,bioluminescenceisachemicalreaction.[D]Insomespecies,bioluminescenceisusedforcommunicationandreproduction.[E]However,thecommercializationofsuchtechnologiesremainsadistantdreamduetoregulatoryhurdles.[F]Whileweareonlybeginningtofullyunderstandtheecologicalrolesoftheseglowingorganisms.[G]Certainsquidspeciesexpelacloudofbioluminescentinktoconfusepredatorswhiletheyescape.SectionIVWritingPartAYouhaverecentlyattendedathree-dayinternationalacademicconferenceonsustainabledevelopment.Writeareporttoyouruniversity'sacademicboardsummarizingthekeypointsoftheconferenceandsuggestinghowtheuniversitycanimplementtheseideas.Writeyourreportinnolessthan150words.PartBWriteanessaydiscussingtheimpactofartificialintelligenceonthefutureofhighereducation.Discussboththepotentialbenefitsandthechallenges,andprovideyourownopiniononhowuniversitiesshouldadapt.Writeyouressayinnolessthan200words.AnswerKeyandDetailedExplanationsSectionIListeningComprehension1.[B]Theprofessorexplicitlystatesthat"Self-reporteddatacanbeheavilybiased.Peopletendtooverestimatetheirproductivitywhenworkingfromhome."2.[C]Theprofessoradvisesusinga"mixed-methodsapproach,"combining"quantitativemetricswithqualitativeinterviews."3.[B]TheprofessorprovidestheformulaP=4.[C]Thelecturerexplainsthattheprimaryreasonforthetemperaturediscrepancyis"themodificationoflandsurfaces"characterizedbyasphaltandconcrete.5.[B]Evapotranspirationisdefinedas"theprocessbywhichwateristransferredfromthelandtotheatmosphere,"anditslackmeansthereislesscooling.Thus,itisimportantfortransferringwatertotheatmosphereandreducingsurfaceheat.6.[B]Thelecturerstatesthatincities,"anddominate,leadingtowarming,"whereasinruralareas,ishigh.7.[B]Thenewsreportstates,"thesenewbatteriesemployasolidceramicmatrix,"unliketraditionalonesthatuseliquidelectrolytes.8.[B]Thereportmentionsthattheinnovationaddresses"twomajorissues:flammabilityandenergydensity."9.[B]Accordingtotheformula=,thenewdesignreducestheinternalvolume(V)wastedoncoolingsystemsandsafetystructures,therebyincreasing.10.[A]Thereportstatesthat"electricvehiclescouldpotentiallytraveluptoonethousandkilometersonasinglecharge."SectionIIEnglishKnowledgeUtilization11.[A]Acirculareconomyaimsto"eliminate"waste,asitisaclosed-loopsystem.Thegoalistogetridoftheconceptofwasteentirely.12.[B]Thecoreprincipleisdecouplingeconomicactivityfromthe"consumption"offiniteresources,meaningwecangroweconomicallywithoutusingupallourresources.13.[C]Traditionally,economicgrowthhasbeenlinkedtoenvironmental"degradation"(damageordeterioration).14.[B]Inacirculareconomy,productlifeis"extended"(madelonger)tomaintainvaluesforaslongaspossible.15.[C]Thesematerialsare"cycled"productively,meaningtheyarekeptmovingwithintheeconomy,usedagainandagain.16.[A]Implementingacirculareconomyrequiresafundamental"shift"(change)inhowbusinessesoperate.17.[B]Ifacompanyretainsownershipandsellsaservice,theyareincentivizedtocreate"durable"productsthatlastlongerandareeasilyrepairable.18.[C]Thecirculareconomymodel"stimulates"(encourages)innovationandjobcreationinvarioussectors.19.[A]Governmentsfacilitatethistransitionthrough"regulatory"policies,suchasextendedproducerresponsibilityschemes.20.[C]Thetransitionisnotmerelyanenvironmentalnecessitybutacompellingeconomic"opportunity"thatpromisesresilienceandprosperity.SectionIIIReadingComprehensionPartAText121.[C]Thefirstparagraphstatesthatthemicrobiome"hasemergedasacriticalfactorinregulatingvariousphysiologicalprocesses"andhighlightsitsimpactonbraindevelopment.22.[B]Thetextnotesthatgerm-freemiceshowed"alteredbehaviors,includingincreasedanxietyandimpairedmemoryformation."23.[C]Thetextmentionsthatmicrobialmetabolites,likeshort-chainfattyacids,"caninfluenceneuroinflammationandeventheproductionofneurotransmitterslikeserotonin."24.[B]Theauthornotesthatwhileearlyresultsarepositive,"thefieldisstillinitsinfancy"and"themechanismsofactionarehighlycomplexandstrain-specific,"implyingmoreresearchisneeded.25.[B]"Adjunct"inthiscontextreferstoan"adjuncttherapy,"whichisanadditionalorsupplementarytreatment,notaprimarycure.Text226.[B]Thetextexplainsthatasspacecrafttravelfurtherfromthesun,solarradiationdiminishesaccordingtotheinverse-squarelaw,makingsolarpanelslesseffective.27.[B]UsingtheformulaP=,ifd=328.[C]ThetextdefinesRTGsasdevicesthat"converttheheatgeneratedbythenaturalradioactivedecay...intoelectricitythroughtheSeebeckeffect."29.[C]Thetextexplicitlystates,"Overtime,thethermaloutputoftheisotopedecreases...andthethermocouplesdegrade,leadingtoagradualdeclineinpoweroutput."30.[B]Engineersmust"preciselycalculatetheinitialandexpectedηtoensurethespacecraftwillhavesufficientpowerattheendofitsmissionlifetime."Text331.[B]ProponentsargueUBI"providesasafetynetagainstjobdisplacementcausedbyautomationandartificialintelligence."32.[A]Thepovertytrapisdescribedasasituationwheretakingalow-payingjobresultsinthe"lossofbenefits,effectivelyimposingahighmarginaltaxrateonthepoor."33.[C]Theprimaryobjectionisthecost,which"wouldrequiremassivegovernmentexpenditure,necessitatingsubstantialtaxincreases."34.[C]Thetextmentionsthatempiricalevidenceismixed,withsomestudiesshowingminimalimpact,whileothersindicatea"slightreductioninworkinghours"amongspecificdemographics.35.[B]Theauthor'stoneisobjective,concludingthatthedebate"ultimatelyhingesonatrade-offbetweenthesocialsecurityprovided...andthepotentialeconomicdisincentives."PartB36.[C]Theprevioussentenceintroducesbioluminescence.Thefollowingsentencetalksabout"thisreaction."Therefore,asentenceintroducingthechemicalreactionisneeded.[C]fitsperfectly:"Atitscore,bioluminescenceisachemicalreaction."37.[A]Theparagraphdiscussesdefensemechanisms.[A]givesanexampleofadefensemechanism(the"burglaralarm"strategy).38.[D]Thesentencebeforethisblankdiscussespredation.Thesentenceaftertalksabout