2026年托福阅读试题及答案

2026年托福阅读试题及答案

Passage1

TheTheoreticalChallengesofTerraforming

Terraforming,thehypotheticalprocessofdeliberatelymodifyingtheatmosphere,temperature,surfacetopography,orecologyofaplanet,moon,orotherbodytobesimilartotheenvironmentofEarth,makingithabitablebyhumans,haslongbeenastapleofsciencefiction.However,asplanetaryscienceadvances,theconceptisincreasinglysubjectedtorigorousscientificscrutiny.Whilethebasicprinciplesofplanetaryengineeringareunderstoodinageneralsense,thepracticalapplicationoftheseprinciplesonaplanetaryscalepresentschallengesthatmaybeinsurmountablewithcurrentorforeseeabletechnology.TheprimarytargetsforsuchendeavorsinthesolarsystemareMarsandVenus,yettheobstaclesforeachdifferfundamentallyduetotheirdistinctevolutionarypaths.

Marsisoftenconsideredthemostviablecandidateforterraforming.ItpossessesadaylengthremarkablysimilartoEarth's,anditislocatedwithintheSun'shabitablezonewhereliquidwatercouldtheoreticallyexist.However,theMartianatmosphereiscurrentlyextremelythin,composedmostlyofcarbondioxide,withasurfacepressurelessthanonepercentofEarth's.Thislackofatmosphericdensitypreventstheretentionofheat,leadingtoaveragetemperaturesof-60degreesCelsius.Themostwidelyproposedsolutioninvolvestriggeringagreenhouseeffecttowarmtheplanet,therebyreleasingfrozencarbondioxidefromthepolarcapsandregolith.Thisthickeningoftheatmospherewouldtheoreticallyraisesurfacepressureandtemperature.However,recentstudiessuggestthatthetotalinventoryofcarbondioxideonMarsmaybeinsufficienttocreateanatmospheredenseenoughtosupportliquidwateronthesurface.Evenifsufficientvolatileswerefound,thelackofaglobalmagneticfieldonMarsmeansthatthesolarwindwouldgraduallystripawayanynewlycreatedatmosphereovergeologicaltimescales,potentiallyrequiringconstant,energy-intensivereplenishment.

Furthermore,theethicalimplicationsofterraformingremainacontentioustopic.Ifaplanet,evenoneasseeminglydeadasMars,possessesmicrobiallife,alteringitsenvironmenttosuithumanneedswouldconstituteanactofbiologicalgenocide.ThediscoveryofextinctorextantlifeformsonMarswouldnecessitateaprofoundreevaluationofthemoralweightofterraforming.ProponentsarguethatthepotentialtoexpandhumancivilizationandpreserveEarth'sbiospherebycreatinga"backup"outweighstheintrinsicvalueofprimitivealienmicrobes.Opponents,however,adheretotheprincipleofintrinsicvalue,suggestingthattherightofanalienecosystemtoexistundisturbedisparamount.ThisdebateisnotmerelyphilosophicalbuthaspracticalimplicationsforinternationallawandtheprotocolsestablishedbybodiesliketheCommitteeonSpaceResearch(COSPAR).

Venuspresentsacontrastingsetofproblems.Whileithasathickatmosphere,itiscomposedprimarilyofcarbondioxide,resultinginarunawaygreenhouseeffectthatcreatessurfacetemperatureshotenoughtomeltlead.AnyterraformingeffortonVenuswouldrequiretheremovalofvastquantitiesofatmosphericgasortheconversionofthatgasintoastable,solidform.Someproposalsinvolveinjectingmassiveamountsofcalciumormagnesiumintotheatmospheretosequestercarbondioxideascarbonates.Otherssuggestusingsolarshadestocooltheplanet,causingtheatmospheretorainoutandeventuallyfreeze.However,theenergyrequirementsforsuchplanetary-scalegeoengineeringareordersofmagnitudebeyondcurrenthumancapabilities.Additionally,Venus'sslowrotation—retrogradeandextremelylong—wouldresultinaday-nightcyclevastlydifferentfromEarth's,potentiallycreatingextremeweatherpatternsevenaftertemperaturestabilization.

Beyondthephysicalandengineeringhurdles,theeconomicandsociopoliticalfeasibilityofterraformingisquestionable.Thetimescalesinvolvedarevast;evenoptimisticestimatessuggestthatmakingMarshabitablecouldtakecenturiesormillennia.Maintainingthepoliticalwillandfinancialcontinuitynecessaryforsuchamulti-generationalprojectisachallengeinitself,giventheshort-termcyclesofhumangovernanceandeconomics.Moreover,thepotentialforconflictovertheownershipandutilizationofaterraformedbodyintroducesalayerofgeopoliticalriskthatcannotbeignored.Ashumanitystandsontheprecipiceofbecominganinterplanetaryspecies,thedreamofreshapingworldsforcesustoconfrontnotonlythelimitsofourtechnologybutalsotheboundariesofourwisdom.

Questions1-10

1.Theword"scrutiny"inthepassageisclosestinmeaningto

A.Imagination

B.Examination

C.Approval

D.Speculation

2.Accordingtoparagraph2,whyisMarsconsideredapotentialcandidateforterraforming?

A.Ithasathickatmosphererichincarbondioxide.

B.Italreadypossessesaglobalmagneticfield.

C.Itsdaylengthandlocationallowforthepotentialexistenceofliquidwater.

D.Itssurfacetemperatureiscurrentlystableandwarm.

3.WhichofthefollowingisNOTmentionedinparagraph2asachallengetoterraformingMars?

A.Theinsufficientquantityofcarbondioxidetocreateadenseenoughatmosphere.

B.Thepresenceofaglobalmagneticfieldthatstripsawaytheatmosphere.

C.Thelowsurfacepressurepreventingheatretention.

D.Thegradualerosionoftheatmospherebythesolarwind.

4.Theword"volatiles"inthepassagerefersto

A.Solidrockformationsfoundonthesurface.

B.Substancesthatevaporateeasilyatmoderatetemperatures,likegases.

C.Themagneticinstrumentsusedtoscantheplanet.

D.Themicrobiallifeformspotentiallyexistinginthesoil.

5.Inparagraph3,theauthorintroducestheethicalimplicationsofterraforminginorderto

A.Arguethatthetechnicaldifficultiesmaketheprojectimpossible.

B.Highlighttheconflictbetweenhumanexpansionandthepreservationofpotentialalienlife.

C.ProvethatmicrobiallifeonMarsisdefinitelyextinct.

D.Supporttheideathatinternationallawsshouldbeignoredforscientificprogress.

6.Accordingtoparagraph4,howdoesVenus'senvironmentdifferfromMars'sregardingthegreenhouseeffect?

A.Venushasathinatmospherethatcannottrapheat.

B.Venushasarunawaygreenhouseeffectcausingextremeheat.

C.Venuslackscarbondioxideinitsatmosphere.

D.Venushasafastrotationthatstabilizestemperatures.

7.Theword"sequester"inthepassageisclosestinmeaningto

A.Release

B.Isolate

C.Analyze

D.Destroy

8.Whatcanbeinferredfromparagraph5abouttheeconomicfeasibilityofterraforming?

A.Thecostsarelowenoughforasinglenationtomanage.

B.Theprojectwouldlikelybecompletedwithinasinglehumanlifetime.

C.Short-termpoliticalcyclesmayhinderthelong-termfundingrequired.

D.EconomicinstabilityonEarthwouldbeimmediatelysolvedbyterraforming.

9.Lookatthefourletters[A],[B],[C],and[D]thatindicatewherethefollowingsentencecouldbeaddedtothepassage.

Thisprocess,knownasatmosphericstripping,wouldleavethesurfaceexposedtoharmfulcosmicradiation.

Wherewouldthesentencebestfit?

[A]Evenifsufficientvolatileswerefound,thelackofaglobalmagneticfieldonMarsmeansthatthesolarwindwouldgraduallystripawayanynewlycreatedatmosphereovergeologicaltimescales,potentiallyrequiringconstant,energy-intensivereplenishment.

[B]Venuspresentsacontrastingsetofproblems.

[C]Whileithasathickatmosphere,itiscomposedprimarilyofcarbondioxide,resultinginarunawaygreenhouseeffectthatcreatessurfacetemperatureshotenoughtomeltlead.

[D]AnyterraformingeffortonVenuswouldrequiretheremovalofvastquantitiesofatmosphericgasortheconversionofthatgasintoastable,solidform.

10.Directions:Anintroductorysentenceforabriefsummaryofthepassageisprovidedbelow.CompletethesummarybyselectingtheTHREEanswerchoicesthatexpressthemostimportantideasinthepassage.Somesentencesdonotbelonginthesummarybecausetheyexpressideasthatarenotpresentedinthepassageorareminorideasinthepassage.

Terraformingisacomplextheoreticalconceptthatinvolvesmodifyingotherplanetstosupporthumanlife,butitfacessignificantobstacles.

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A.Marsisaprimarytargetduetoitsdaylengthandlocation,butitlackssufficientatmosphericdensityandamagneticfieldtoeasilysustainahabitableenvironment.

B.Venuspresentsadifficultchallengebecauseitsthickatmospherecausesextremeheatthatwouldrequiremassiveenergyinputstomitigate.

C.TheMooniscurrentlythebestoptionforterraformingbecauseitistheclosestcelestialbodytoEarth.

D.Ethicalconcernsariseregardingthepotentialdestructionofalienmicrobiallifeformsforthebenefitofhumanexpansion.

E.Thetechnologyrequiredforterraformingisfullydevelopedandonlyneedsfinancialinvestmenttobeimplemented.

F.Long-termpoliticalandeconomicstabilityisnecessarytosustainthemulti-generationaleffortrequiredforsuchprojects.

Passage2

TheDeclineoftheHarappanCivilization

TheIndusValleyCivilization,alsoknownastheHarappanCivilization,wasaBronzeAgecivilizationextendingfrommodern-daynortheastAfghanistantoPakistanandintonorthwestIndia.ItflourishedinthebasinsoftheIndusRiver,oneofthemajorriversofAsia.Fromapproximately3300to1300BCE,thiscivilizationdevelopedoneoftheworld'searliesturbansocieties,characterizedbysophisticatedcityplanning,advanceddrainagesystems,andstandardizedweightsandmeasures.UnlikeitscontemporariesinMesopotamiaandEgypt,theHarappanCivilizationleftbehindnomonumentalpalacesortemples,noobvioussignsofacentralizedrulingclass,andascriptthatremainsundeciphered.Thisenigmaticcivilizationmysteriouslydeclinedaround1900BCE,acollapsethathaspuzzledarchaeologistsfordecades.

Severaltheorieshavebeenproposedtoexplainthedeclineofthisonce-greatsociety.OneoftheearliestandmostpersistenttheoriessuggeststhataninvasionbyIndo-AryantribesfromthenorthwestcausedthedestructionoftheInduscities.ThistheorywaslargelybasedontheinterpretationofskeletalremainsfoundatMohenjo-daro,whichsomeearly20th-centuryarchaeologistsclaimedindicatedamassacre.However,modernarchaeologicalanalysishaslargelydiscreditedthisinvasiontheory.Theskeletalevidencedoesnotsupportamassivebattleorslaughter;rather,itsuggestsagradualdemographicshift.Furthermore,thematerialcultureoftheIndusValleyappearstohaveevolvedintoapost-urbanphaseratherthanbeingabruptlyreplacedbyaforeignculture.The"AryanInvasionTheory"hasthusbeensupersededbymodelsemphasizinginternalfactorsandenvironmentalchanges.

Amorecompellingexplanationfocusesonenvironmentaldegradationandclimatechange.TheIndusRiversystemwasdependentonregularmonsoonrainsandglacialmeltwaterfromtheHimalayas.Geologicalevidenceindicatesthataround1900BCE,themonsooncyclebegantoweaken,leadingtoaprolongeddroughtintheregion.Thisreductioninwaterflowwouldhavedevastatedtheagriculturalsystemthatsupportedthemassiveurbanpopulation.Astheriversdrieduporshiftedcourse,thecitiesthatreliedonthemforwaterandtransportwouldhavebecomeunsustainable.Thesophisticateddrainagesystems,onceahallmarkofthecivilization,mighthavebecomeliabilitiesifthewaterlevelsdroppedtoolowtoflushthemout,leadingtosanitationissuesanddisease.

Additionally,humanactivitymayhaveexacerbatedtheenvironmentalproblems.TheHarappansreliedheavilyonintensiveagricultureandtheburningofwoodforfuelandbrick-making.Overcenturies,thisdeforestationandoveruseofnaturalresourcescouldhaveledtosoilerosionandareductioninsoilfertility.Asthelandbecamelessproductive,thecivilizationmighthaveengagedinwarsoverdwindlingresources,furtherdestabilizingthesocialorder.ThedeclineoftradenetworkswithMesopotamiaandotherregions,possiblyduetoeconomicinstabilityortheriseofalternativetraderoutes,wouldhaveseveredacrucialsourceofrawmaterialsandrevenue,acceleratingthecollapse.

ThedeclineoftheHarappanCivilizationwaslikelynotasingulareventbuta"systemcollapse"—acascadingfailureofinterconnectedsystems.Astheeconomyweakened,theurbanpopulationmighthavemigratedbacktoruralvillagestosurvive,leadingtothede-urbanizationoftheregion.Thismigrationexplainswhythegreatcitieswereabandonedbuttheculturedidnotentirelyvanish;elementsofHarappanculturesurvivedinsmaller,ruralsettlementsintheGujaratregionandbeyond.Thelossofcentralizedauthorityandthescriptsuggeststhatthecomplexadministrativestructuresrequiredtorunthecitiesdisintegrated,butthepeoplethemselveslikelyadaptedtoasimpler,moresubsistence-levellifestyle.Thisresilienceinthefaceofcollapsehighlightstheadaptabilityofhumansocieties,evenasitmournsthelossofoneofhistory'smostadvancedearlycivilizations.

Questions11-20

11.Theword"enigmatic"inthepassageisclosestinmeaningto

A.Mysterious

B.Powerful

C.Ancient

D.Documented

12.Accordingtoparagraph1,whichofthefollowingisacharacteristicoftheHarappanCivilizationthatdistinguishesitfromMesopotamiaandEgypt?

A.Ithadasophisticatedsystemofcityplanning.

B.Itpossessedstandardizedweightsandmeasures.

C.Itlackedmonumentalpalacesandobviouscentralizedrulers.

D.Itreliedheavilyonamajorriversystem.

13.Whydoestheauthormentionthe"AryanInvasionTheory"inparagraph2?

A.Toprovidethedefinitiveexplanationforthecivilization'scollapse.

B.Tocontrastitwithmodernarchaeologicalfindingsthatsuggestamoregradualdecline.

C.ToprovethattheskeletalremainsfoundatMohenjo-darowereindeedvictimsofwar.

D.TohighlightthemilitarysuperiorityoftheIndo-Aryantribes.

14.Accordingtoparagraph3,whatwastheprimaryeffectoftheweakeningmonsooncyclearound1900BCE?

A.ItcausedtheIndusRivertofloodthecitiesexcessively.

B.Itledtoadroughtthatdevastatedtheagriculturalsystem.

C.ItencouragedthemigrationofpeoplefromMesopotamiaintotheIndusValley.

D.Itimprovedthedrainagesystemsintheurbancenters.

15.Theword"exacerbated"inthepassageisclosestinmeaningto

A.Ignored

B.Caused

C.Worsened

D.Balanced

16.Paragraph4supportstheideathathumanactivitycontributedtothedeclineby

A.Failingtodeveloptradenetworkswithothercivilizations.

B.Engaginginexcessivedeforestationandsoildegradation.

C.Abandoningthecitiestooearlytosavetheresources.

D.Refusingtoadapttonewagriculturaltechnologies.

17.Whatcanbeinferredfromparagraph5aboutthefateoftheHarappanpeople?

A.Theywerecompletelywipedoutbytheenvironmentaldisasters.

B.TheymigratedtoMesopotamiaandjoinedothercivilizations.

C.Theyabandonedurbancentersandlikelymovedtoruralsettlements.

D.Theyimmediatelydevelopedanewscripttoreplacethelostone.

18.Whichofthesentencesbelowbestexpressestheessentialinformationinthefollowingsentence?

"Thesophisticateddrainagesystems,onceahallmarkofthecivilization,mighthavebecomeliabilitiesifthewaterlevelsdroppedtoolowtoflushthemout,leadingtosanitationissuesanddisease."

A.Becausethewaterlevelsdropped,thedrainagesystemsfailedtowork,causinghealthproblemsforthepopulation.

B.Thehallmarkofthecivilizationwasitssophisticateddrainagesystems,whichpreventeddiseaseeffectively.

C.SanitationissuesweretheprimarycauseofthedeclineoftheHarappanCivilization.

D.Thedrainagesystemsweretoosophisticatedandrequiredtoomuchwatertooperateefficiently.

19.Directions:CompletethetablebelowbymatchingtheappropriatecausesoreffectswiththespecifictheoriesregardingthedeclineoftheHarappanCivilization.Thisquestionisworth3points.

TheoriesRegardingtheDecline

Causes/Effects

A.Invasionbyforeigntribes

B.Environmentaldegradationandclimatechange

C.Systemcollapseandmigration

D.Skeletalevidenceofamassacre

E.Gradualweakeningofmonsoonrains

F.Abandonmentofurbancentersforrurallife

G.Preservationofthecentralizedrulingstructure

20.Theword"subsistence"inthepassageisclosestinmeaningto

A.Luxury

B.Survival

C.Agricultural

D.Complex

Passage3

BatesianMimicryandEvolutionaryArmsRaces

Inthenaturalworld,theappearanceofanorganismisoftenthekeytoitssurvival.Whilesomeanimalsrelyoncamouflagetoblendintotheirsurroundings,othersemploytheoppositestrategy:conspicuousness.Thisphenomenoniscentraltotheconceptofaposematism,wherepreyspeciesadvertisetheirtoxicityorunpalatabilitytopotentialpredatorsthroughbrightcolorsordistinctpatterns.Predatorslearntoassociatethesewarningsignalswithabadexperience—suchasafoultasteorapoisonoussting—andsubsequentlyavoidthesepreyinthefuture.However,theevolutionarysuccessofaposematicspecieshasgivenrisetoafascinatinganddeceptivestrategyknownasBatesianmimicry,namedafterthe19th-centurynaturalistHenryWalterBates.

Batesianmimicryoccurswhenaharmlessspeciesevolvestoimitatetheappearanceofaharmfulorunpalatablespecies.Themimicgainsprotectionbecausepredatorsmistakeitforthemodel,thedangerousspeciesthatpossessestheactualdefense.Forthisstrategytobeeffective,severalconditionsmustbemet.First,themimicmustresemblethemodelcloselyenoughtofoolthepredator;smalldifferencesinpatternorcolorationcanallowastutepredatorstodistinguishthetastymimicfromthetoxicmodel.Second,themodelmustbesignificantlymoreabundantthanthemimic.Ifthemimicweremorecommon,predatorswouldfrequentlyattackthepalatablemimicsandlearnthatthewarningsignalisnotalwaysassociatedwithunpleasantconsequences.Thiswouldleadtothebreakdownofthemimicryadvantage.Thus,thefrequencyofthemimicinthepopulationisnaturallylimitedbythefrequencyofthemodel.

TheevolutionarydynamicsofBatesianmimicrycreatea"armsrace"betweenthepredator,themodel,andthemimic.Aspredatorsbecomebetteratdistinguishingthemimicfromthemodel(aprocessknownasdiscriminativeavoidance),theselectionpressureonthemimicincreases.Mimicsthatlookmorelikethemodelsurviveandreproduce,drivingthemimicpopulationtowardacloserresemblance.Conversely,modelsmayalsoevolvetochangetheirappearanceslightlytodistancethemselvesfromthemimics,althoughthisislesscommonbecausethemodel'sprimarydefenseisitstoxicity,notjustitsappearance.Thepredator'sabilitytolearnandrememberspecificwarningsignalsplaysacrucialroleinthistriangularinteraction.Ifthepredatorpopulationincludesahighproportionofyoung,inexperiencedindividuals,theadvantageforthemimicishigher,asthesenaivepredatorsaremorelikelytobedeceived.

AclassicexampleofBatesianmimicryisseenintherelationshipbetweenthevenomousEasternCoralSnakeandtheharmlessScarletKingsnakeinNorthAmerica.TheEasternCoralSnakepossessesadistinctivepatternofred,yellow,andblackbandsanddeliversapotentneurotoxicvenom.TheScarletKingsnake,whichisnon-venomousandconstrictsitsprey,hasevolvedastrikinglysimilarcolorpattern.Theeffectivenessofthismimicryissoprofoundthatmanypredatorsinstinctivelyavoidthepattern,abehaviorknownasinnateavoidance.However,inregionswherethecoralsnakeisabsent,thekingsnake'spatternbecomeslessprotective,andthepatternmayevenfadeoverevolutionarytimeduetothelackofselectivepressuretomaintainthecostlycoloration(whichmaymakethesnakemorevisibletootherprey).

Interestingly,thereisamorecomplexformofmimicryknownasMullerianmimicry,whichdiffersfromBatesianmimicry.InMullerianmimicry,twoormoreharmfulorunpalatablespeciesevolvetoresembleeachother.Bysharingacommonwarningsignal,thesespeciesreducethemortalityrateforallinvolved.Predatorsonlyneedtolearnonewarningpatterntoavoidmultipledangerousspecies.ThiscooperativeformofmimicrystandsincontrasttothedeceptivenatureofBatesianmimicry.WhiletheBatesianmimicisaparasiteonthemodel'sreputation,Mullerianmimicsaremutualisticpartnerssharingthecostof"educating"predators.Understandingthedistinctionbetweenthesetwotypesofmimicryprovidesdeepinsightintotheselectivepressuresthatshapethediversityoflife,illustratinghowthestruggleforsurvivalcandrivebothdeceptionandcooperationinequalmeasure.

Questions21-30

21.Theword"conspicuousness"inthepassageisclosestinmeaningto

A.Noticeability

B.Camouflage

C.Agility

D.Toxicity

22.Accordingtoparagraph1,whatisaposematism?

A.Astrategywherepreyspeciesblendintotheirsurroundingstohidefrompredators.

B.Astrategywhereharmlessspeciesimitatedangerousones.

C.Amethodpredatorsusetodetectpoisonousprey.

D.Anadvertisementofaspecies'toxicityorunpalatabilitythroughwarningsignals.

23.Whydoestheauthormentionthe"frequencyofthemimic"inparagraph2?

A.Toexplainwhymimicsarealwaysmorecolorfulthanmodels.

B.Toarguethatmimicsaregenerallylesssuccessfulthanmodels.

C.Toillustratethatthesuccessofthemimicrydependsonthemimicbeinglesscommonthanthemodel.

D.Toprovethatpredatorsprefertoattackcommonspecies.

24.Theword"deceptive"inthepassageisclosestinmeaningto

A.Defensive

B.Misleading

C.Aggressive

D.Protective

25.Accordingtoparagraph3,howdoesthepredatorinfluencetheevolutionofthemimic?

A.Predatorsteachthemimicshowtobecometoxic.

B.Predatorsthatcandistinguishbetweenthemimicandthemodelforcethemimictoevolveacloserresemblance.

C.Predatorsignorethemodelsandfocussolelyonthemimics.

D.Predatorshelpthemimicbyspreadingthewarningsignaltootherpredators.

26.WhathappenstotheScarletKingsnakeinregionswheretheEasternCoralSnakeisabsent?

A.Itbecomesvenomoustoprotectitself.

B.Itchangesitsdiettobecomemorelikethecoralsnake.

C.Itsdistinctivecolorpatternmayfadeovertime.

D.Itmigratestoareaswherethecoralsnakeispresent.

27.Theword"instinctively"inthepassageisclosestinmeaningto

A.Reluctantly

B.Learned

C.Innately

D.Carefully

28.HowdoesMullerianmimicrydifferfromBatesianmimicry?

A.Mullerianmimicryinvolvesaharmlessspeciesimitatingaharmfulone.

B.InMullerianmimicry,bothspeciesinvolvedareharmfulandshareawarningsignal.

C.Mullerianmimicryisaparasiticrelationship,whileBatesianmimicryismutualistic.

D.Mullerianmimicryreliesonthepredatorbeingyoungandinexperienced.

29.WhichofthefollowingcanbeinferredfromthepassageaboutthecostofBatesianmimicry?

A.Itisenergeticallyexpensivetoproducethetoxinsrequiredforthedefense.

B.Thebrightcolorationcanmakethemimicmorevisibletoitsprey.

C.Themimicmustsacrificeitsabilitytocamouflagecompletely.

D.Themimicisdependentonthemodelforitsphysicalsurvival.

30.Directions:Anintroductorysentenceforabriefsummaryofthepassageisprovidedbelow.CompletethesummarybyselectingtheTHREEanswerchoicesthatexpressthemostimportantideasinthepassage.Somesentencesdonotbelonginthesummarybecausetheyexpressideasthatarenotpresentedinthepassageorareminorideasinthepassage.

Mimicryisacomplexevolutionaryadaptationthatinvolvesinteractionsbetweenpredators,models,andmimicstoensuresurvival.

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A.Aposematismisastrategywherepreyusebrightcolorstowarnpredatorsoftheirtoxicity.

B.Batesianmimicryinvolvesaharmlessspeciesimitatingaharmfulonetogainprotection,requiringthemimictobelesscommonthanthemodel.

C.HenryWalterBateswastheonlynaturalisttostudytherelationshipbetweencoralsnakesandkingsnakes.

D.Anevolutionaryarmsraceoccursaspredatorsimprovetheirabilitytodistinguishmimicsfrommodels.

E.Mullerianmimicryinvolvesmultipleunpalatablespeciesresemblingeachothertoreinforcethewarningsignal.

F.Allformsofmimicryareconsideredparasiticbecausetheydeceivethepredator.

***

AnswerKeyandExplanations

1.B

Analysis:Inthepassage,"scrutiny"appearsinthecontextofscientifictheoriesbeingexaminedclosely."Examination"istheclosestsynonym."Imagination"istoocreative,"approval"ispositiveagreement,and"speculation"isguessingwithoutevidence.

2.C

Analysis:Paragraph2states,"ItpossessesadaylengthremarkablysimilartoEarth's,anditislocatedwithintheSun'shabitablezonewhereliquidwatercouldtheoreticallyexist."ThismatchesoptionC.OptionsAandBareincorrect(Marshasathinatmosphereandnoglobalmagneticfield).OptionDisincorrect(Marsiscold).

3.B

Analysis:Paragraph2mentionsthelackofaglobalmagneticfieldasachallenge,butitdoesnotsaythatamagneticfieldstripsawaytheatmosphere;rather,thelackofoneallowsthesolarwindtostripit.OptionBisincorrectbecauseitstatesMarspossessesaglobalmagneticfield.OptionsA,C,andDarementionedaschallenges.

4.B

Analysis:Inthecontextofreleasingfrozencarbondioxide,"volatiles"referstosubstancesthatchangereadilyfromsolidtogas(likecarbondioxideorwaterice).

5.B

Analysis:Paragraph3introducesthedebatebetweenthepotentialbenefitofhumanexpansionandthemoralcostofdestroyingalienlife.ThishighlightstheconflictmentionedinoptionB.

6.B

Analysis:Paragraph4statesthatVenushasa"runawaygreenhouseeffectthatcreatessurfacetemperatureshotenoughtomeltlead."ThiscontrastswithMars,whichistoocold.OptionBiscorrect.

7.B

Analysis:"Sequester"inthecontextofcapturingcarbondioxidemeanstoisolateorlockitaway."Release"istheopposite."Analyze"and"destroy"donotfitthecontextofformingcarbonates.

8.C

Analysis:Paragraph5mentionsthat"maintainingthepoliticalwillandfinancialcontinuitynecessaryforsuchamulti-generationalprojectisachallengeinitself,giventheshort-termcyclesofhumangoverna