高考阅读理解D篇集训（六）

高考阅读理解D篇集训（六）阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在题卡上将该项涂黑。P051Socialintegrationistheprocessthroughwhichminoritygroupsinteract,cometogetherorareincorporatedwithinacommunity.Increasedsocialintegrationhelpsreduceconflictandtensioninsociety,anditcanhelpthenewmigrantsfeelmoreconnectedtotheirnewcommunity.Howdodifferentgroupsremainrelativelyunitedinsociety?Afewcountriesaroundtheworldhaveadoptedintegratedframeworkstoensurethereareequalopportunitiesformigrantsregardlessoftheirbackgrounds.SomeEuropeancountrieshavelearnttoembracemulticulturalismwell.Therearestillongoingeffortstonarrowthedifference,andthegovernmentshaveencouragedtheirimmigrantstotakeanactivepartinsocial,cultural,economicandpoliticalactivities.Integrationtakesplaceinneighborhoods,workplaces,schoolsandpublicplaceswherepeoplefromdiversebackgroundsspendmostoftheirtime.Formaleducation,especiallyamongtheyoungerchildren,isonecommonplatformthatbringstogetherdiversifiedgroups.Beinginthesameclassastheirforeignfellowstudentswillteachthelocalchildrenthemeaningoftoleranceandempathy(共情).Participationinsports,communityengagementandvolunteerworkarealsootherpossiblewaysthatpromotecooperationandotherformsoftolerance.Fromparticipatinginartsprogramstobeingparentvolunteersinschools,theseplatformsprovideopportunitiesforpeopletomixandworktowardsacommoncause.Intheseways,meaningfulrelationshipsamongthoseofdifferentages,ethnicgroupsarebuiltonthebasisofcommoninterests.Socialintegrationisnodoubtadynamicprocess.Still,countrieshavealsoacknowledgedthathumanmovementacrossborderscannotbestopped.Instead,itshouldbebettermanagedsothatmigrationissafe,legalandbeneficialforeveryone.Societiesarebetteroffiftheypromotesocialintegrationthroughcommonpracticesthatreducetension,discriminationandpovertyIndeed,thegovernmentandlocalcommunityplayakeyroleinintegratingthesenewcomersandmakingthemcontributetonewcommunities,whilekeepingtheiridentities.WhatmaySocialIntegrationbringtothenewimmigrants?A.Moreconflictsinsociety. B.Closerconnectionincommunity.C.Minoritytensioningroups. D.Increasingdifferencesintradition.Whatdoestheunderlinedword“embrace”inparagraph2mean?A.Create. B.Judge. C.Accept. D.Resist.Whatcanwelearnfromparagraph3?A.Formaleducationmattersinintegration.B.VoluntaryworkistaughtbydoingsportsC.Diversifiedgroupscanbedividedinschool.D.Commoninterestsareprovidedbyeducation.Whatcanbeachievedbypromotingsocialintegration?A.Adynamicgovernment. B.Asaferborder.C.Alegalcommunity. D.Abetter-offsociety.32-35DCADP052Everyoneknowswhatmakesagoodstory.Ourherostartstheirjourneyasaflawed(有缺陷的)being.Insceneafterscene,theyfacechallengesthatpushthemdownnewpaths.Bytheendofthetale,theyovercomesetbacksandbecomeabetterpersonintheprocess.Welovetheseplotsinthenovelswereadbuttheprinciplesofagoodstoryoffermuchmorethanentertainment.Recentresearchshowsthatthenarratives(叙述)wetellourselvesaboutourlivescanpowerfullyhelpusrecoverfromstress.Peoplewhogeneratetalesofstrugglingandturningoveranewleaffromtheirownlivesappeartohavemuchbettermentalhealth.ProfessorDanMcAdamsputforwardthisideaanddiscoveredthatwhethersomeonecandescribehavinghadsomecontrolovereventsintheirpastisanimportantpredictorofmentalhealth.Anotherkeythemeinvolvedisfindingsomekindofpositivemeaningafterstressfulevents.McAdamsinvited14and15-year-oldstojoininanexperimenttowriteabouttheirexperiencesoffailureandsuccess.Halfofthemwerethengivenextrainstructionstodescribethewaystheyhadmadetheirsuccessarealityandhowthefailurehadchangedthemforthebetter.Eightweekslater,membersofthisgroupreportedgreaterpersistence(坚持)andbettergradesintheirschoolwork.Excitingastheseresultsare,someexpertssoundafewnotesofcaution.Theyworrythat,hearingaboutthepowerofself-narratives,manypeoplemayfeeltheyhavetofindapositiveturningpointinlife.Iftheycan’t,theycouldendupfeelingguiltyabouthavingsomehow“failed”.Clearly,self-narrativesaren’tthepanacea.Nevertheless,ifyouhopeforself-improvement,youcanusethefindingstogoodeffect.Byrccognizingourselvesastheheroatthecenterofourownstruggles,wecanallbecometheauthorofourowndestinyandchangeourselvesforthebetter.Whatdoestheresearchfocuson?A.Thecausesofstress.B.Theprinciplesofnarrative.C.Theconnectionbetweenstruggleandwell-being.D.Thelinkbetweenmentalhealthandself-narratives.Whyistheexperimentmentionedinparagraph3?A.Togiveproof. B.Tomakepredictions.C.Todrawaconclusion. D.Tomakecomparisons.Whatdoestheunderlinedword“panacea”inthelastparagraphreferto?A.Attempttogetridofworries.B.Meansofrecognizingyourself.C.Solutiontoadolescentproblems.D.Guaranteetobecomebetterpeople.Whichofthefollowingcanbethebesttitleforthetext?A.EmbraceLifeStruggles B.BeYourOwnHeroC.WaystoMakeaGoodStory D.ThePowerofSelf-improvement12.D13.A14.D15.BP053Whenlearningaforeignlanguage,mostpeoplefallbackontraditionalmethods:reading,writing,listeningandrepeating.ButBrianMathias’researchteamfoundoutthatifyougesturewithyourarmswhilestudying,youcanrememberthevocabularybetter,evenmonthslater.AsMathiasdescribes,theyhad22German-speakingadultslearnatotalof90inventedartificialwordsoverfourdays.Whilethetestsubjectsfirstheardthenewvocabulary,theywereshownavideoofapersonmakingagesturethatmatchedthemeaningoftheword.Whenthewordwasrepeated,thesubjectsperformedthegesturethemselves.Fivemonthslater,theywereaskedtotranslatethevocabularytheyhadlearnedintoGerman.Thosewhoperformedbetteronthetaskshowedahigherlevelofactivityintheirmotorcortex—thepartofthebrainthatisresponsibleforourbodymovements.Theresearchersconcludedthatthemotorcortexcontributedtothetranslationofthevocabularylearnedwithgestures.Theeffectdidnotoccurwhenthesubjectswereonlypresentedwithmatchingpicturesinsteadofgestures.AnotherresearchgroupledbyLeipzighadyoungadultsandeight-year-oldchildrenlistentonewvocabularyforfivedays,pairedwithmatchingpicturesorvideosofgestures.Aftertwomonths,thetwomethodswerestilltied.Butaftersixmonths,theadultsbenefitedmorefromthegesturesthanthepictures,whilethechildrenwerehelpedequallybyboth.Butitisnotonlythemotorcomponentitselfthatpromoteslearning.Themeaningconveyedbythegesturealsofiguresin.“Ithinkweunderusegestureinourclassrooms,”Goldin-Meadowsays.“Goodteachersandgoodlistenersuseit,butnotalwaysinasystematicway.Othersdon’tnecessarilybringitintotheclass—anditcouldbeusedmoreoftenandmoreeffective.”WhatisthefindingofBrianMathias’research?A.Translationhelpsvocabularybuilding.B.Motorcortexinterpretsbodylanguage.C.Gesturesfacilitatevocabularylearning.D.Memoryimproveswithregularpractice.WhatdoesLeipzig’sresearchtellusaboutlanguagelearning?A.Adultsandchildrenareequallyefficientlearners.B.Pictureshavelittleinfluenceonlanguagelearning.C.Picturesarefoundmorehelpfulthanvideosforchildren.D.Benefitsofgesturesaremoreevidentinadultsinthelongrun.Whatdotheunderlinedwords“figuresin”inthelastparagraphmean?A.Makesadeal.B.Playsapart.C.Takesachance.D.Givesawarning.Whatdoestheauthorsuggestteachersdointheclassroom?A.Makebetteruseofgestures.B.Teachlisteninginasystematicway.C.Abandontraditionalteachingmethods.D.Dosomeacademicresearchesonteaching.32.C33.D34.B35.AP054Whereverwego,wearesurroundedbyhistory.Acrosstheglobe,culturalheritageispasseddownthroughthegenerations.Itisinthebuildingsandstructuresaroundus.Itisintheartsandartifacts(手工艺品)wetreasure.Itlivesinthelanguageswespeakandthestorieswetell.Buttoday,itisunderattackasneverbefore.Notonlyarethedamagesoftimethreateningourculturalheritage,butconflicts,climatechange,globalizationandtourismareallexactingaheavyprice.Technologyisnowthemostessentialweaponinthebattle.Here’showtechnologyispreservingourculturalheritage.Asyoucanimagine,creatingthereplicas(复制品)viacrowdsourced2Dimagesisextremelytime-consuming.Increasingly,artificialintelligence(AI)algorithms(算法)arebeingusedtodoalltherequiredsourcing,allowingmillionsofimagestobestoredinamatterofhours.AIwillalsomakerestorationandpreservationofexistingculturalheritagefareasierandvastlysuperiortopreviousmethods.Virtualreality(VR)technologywillplayaleadingroleinpreservingourculturalheritageinthecomingyears.Manyofthemostimportantsitesandarchitectureareextremelyfragile.Humaninteractionwiththeselocationsisdoingagreatdealofharm.Wastesaccumulateeverywhere,causingenormousproblems.Asmoreculturalheritagesitesandobjectsaredigitallymappedandrecorded,VRtechnologywillincreasinglybecomethewaythatpeopleexperiencethem.We’llalleventuallybeabletowalkthroughplaces,lookat(andtouch!)artifactsandworksofartwithouteverseeingthemwithourowneyes.Finally,ourculturalheritagewillbepreservedviatechnology.Effortsinresearch,innovation,datasharingandprojectworkwillhelppromoteandpreservetheculturalheritageofcountriesallacrosstheworld.Whatdoestheunderlinedword“exacting”inparagraphImean?A.Paying. B.Cutting. C.Receiving. D.Demanding.WhatistheadvantageofAlinpreservingculturalheritage?A.Itgenerates2Dimages.B.ItmakesrestorationeasierC.Itmakespreservationsafer.D.Itcreatesreplicasinseconds.HowdoesVRhelptopreserveculturalheritage?A.Byrecyclinghugeamountsofwaste.B.Byreducinghumanimpactonthesite.C.Byforbiddingvisitorsfromtouchingartifacts.D.Byeducatingpeopleaboutthesites’importance.Whichofthefollowingcanbethebesttitleforthetext?A.HowTechnologyChangesArtB.WhatCulturalHeritageMeanstoUsC.PreservetheAncientwiththeAdvancedD.PrepareforaRevolutioninTechnology32.D33.B34.B35.CP055Asapopularsubjectofstudyamongevolutionaryecologists,three-spinedstickleback(三刺鱼)isknownfortheirdifferentshapes,sizes,andbehaviours—theycanevenliveinbothseawaterandfreshwater,andunderawiderangeoftemperatures.Butwhatmakesthat?Theresearcherstrackedsixpopulationsofthefishbeforeandafterseasonalchangestotheirenvironment,usinggenomesequencing(基因组测序).Seasonalchangesresultingreatchangesinhabitatstructureandbalanceofsaltandfreshwater,andonlythosefishabletotoleratetheserapidchangessurviveintothenextseason.“Thesechangesprobablyresemblethehabitatshiftsexperiencedbysticklebackpopulationsduringthepast10,000years.”saysProfessorBarrett“Wehopetogaininsightintothegeneticchangesthatmayhaveresultedfromnaturalselectionlonginthepast.”Remarkably,theresearchersdiscoveredtheevidenceofgeneticchangesdrivenbytheseasonalshiftsinhabitats,whichmirroredthedifferencesfoundbetweenlong-establishedfreshwaterandsaltwaterpopulations.“Thesegeneticchangesoccurredinindependentpopulationsoverasingleseason,highlightingjusthowquicklytheeffectsofnaturalselectioncanbedetected,”saysProfessorBarrett,“Thefindingssuggestthatwemaybeabletousethegeneticdifferencestopredicthowpopulationsmayadapttoenvironment.”Theresearchemphasizestheimportanceofstudyingspeciesindynamicenvironmentstogainabetterunderstandingofhownaturalselectionoperates.Infurtherresearch,theyplantoinvestigatehowrepeatabletheobservedgeneticchangesare,bytestingwhethertheyshowupyearafteryear.Doingsowoulddemonstratetheirabilitytoreliablyforecasttheevolutionaryfutureofthesepopulations.Whatdoestheunderlinedword“that”refertoinParagraphl?A.Sticklebackisunderawiderangeoftemperatures.B.Sticklebackispopularwithevolutionaryecologists.C.Sticklebackcanadapttodifferentlivingconditions.D.Sticklebackhasdifferentshapes,sizes,andbehaviors.WhatisParagraph2mainlyabout?A.Thedifficultiesoftheresearch. B.Thepurposeoftheresearch.C.Thebackgroundoftheresearch. D.Themethodsoftheresearch.Whatisthemainreasonforstickleback’ssurvival?A.Habitatshifts. BGeneticchange.C.Seasonalchanges. D.Independentpopulations.Whywillscientistsstudytherepetitionofthegeneticchanges?A.Toknowwhatnaturalselectionis.B.Tostudyspeciesindynamicenvironments.C.Totestthereliabilityofthepresentdiscoveries.D.Toforecasttheevolutionaryfutureofcertainspecies.32-35CDBDP056In2007ateamledbyStefanRahmstorfcomparedactualobservationswithpredictionsmadebytheoreticalmodelsforthreekeyclimateindicators:carbondioxide,globaltemperatureandsea-levelrise.WhilethepredictionsgotCO2levelsright,theywerelowforrealtemperatureandsea-levelrise.Climatescientistshaveasurprisinghabit:Theyoftenunderestimatetheclimatethreat.Thearticlesreportingtheunderestimateshavebeenwidelycited,soonemightthinkthatscientistshavetakencorrectivesteps.ButrecentstudiesofArcticwarmingsuggestthattheproblemmaynothavegoneaway.Aspolaricemeltsbecauseofglobalwarming,theArcticOceanabsorbsmoreheat,whichcausestheArctictowarmevenmore.Itshouldsurprisenoonethattheareaiswarmingfast.Yetscientistshavebeencaughtoff-guardbyjusthowfasttheregionisheatingup.In2013,apaperwaspublishedpointingoutthattheseunderestimatesrepresentsubconsciousbias(偏向)causedbydefensiveness.Scientiststendedtowardlower.andmisleadingpredictionbecausetheydidnotwanttobeaccusedofmakingdramaticandoverstressedclaims.Evennowscientistscontinuetobeaccusedofoverestimatingclimaterisksbyworryingfigureswhichgetmuchmediaattention,thusbiasingtheirmodelstobeunrealisticallyconservative.IfscientistshaveunderestimatedArcticwarming,theyhavelikelyminimizedamountsofpermafrost(永久冻土)meltingandmethane(甲烷)release,aswell,Andthatcouldbetrulydire.becausethepermafrostholdsabout1.5billiontonsoforganiccarbon,twiceasmuchasnowintheatmosphere.Werethatcarbontoberapidlyreleased,itcouldcauseapicture:arunawaygreenhouseeffect,Whateverthecause,it’stimethatscientistslookedseriouslyatwhethertheirmeasuringmodelscontinuetounderestimatecriticalaspectsoftheclimateproblem.Lowestimatescancreatethefalseimpressionthatwehavemoretimetofixtheproblemthanweactuallydo.WhyisRahmstorf’sresearchinParagraph1mentioned?A.Tohighlighttheurgencyinglobalwarming.B.Toshowtheinaccuracyofclimatepredictions.C.Tostatetheimportanceofprecisemeasurement,D.Toexpressthedifficultyinmakingrightpolicies.Whydoclimatescientistsalwaysunderestimateclimatethreats?ATheyaremisledbythestatistics.B.Theirreportshavebeenwidelycited.C.Theywanttoavoidblameforcausinganxiety.D.Theyaimtodefendthemselvesfromfakeinformation.Whatdoestheunderlinedword“dire”inParagraph4probablymean?A.Disastrous. B.Confusing. C.Impressive. D.Discouraging.What’sthebesttitleofthistext?A.TheArcticOceanIsCallingforHelp B.ClimateScientistsAreUnderFireC.TheWarmingPaceIsUnderestimated D.ClimatePredictionsProveCorrect32-35BCACP057Withroundsofpioneeringspaceflightsthatcouldsetthestageforfuturespacetourism,itisworthlookingatwhatmightbeinvolvedforthehumanexplorationofMars,thoughit’slikelydecadesaway.Technologicalchallengesaside,aswecontinuetoexpandourexplorationofMars,thereisaquestion:Whatmightbethelessonsofpastvoyagesofdiscoverythatweshouldthinkabout?Humanexplorationhasledtomanyextraordinarynewdiscoveries,butithasalsoledtotheexploitation(开发)ofresources.NotlongafterearlyEuropeansettlersarrivedatAmerica,theydeclaredtheirindependenceandcreatedtheconstitutionbywhichmodernAmericansocietyfunctions.However,thisdidnotpreventthesettlersfromreferringtonativepeopleassavagesandtakingawaytheirrightstoliberty,happiness,andevensurvival.NativeAmericanswerequicklykilledbywarsandnewdiseasesasthenewsettlersexpandedtheirland.Thenaturalenvironment,withwhichtheyhadestablishedaharmoniousrelationship,wassimilarlydestroyedbythesettlement.Marscertainlyhasanimpossibleenvironmentforhumanlife,butonMars,humanswillbetheinvasive(侵略的)species.WillourlandingonmarsbreaktheecosystemonMars?ItispossiblethatMarshasidealmineralsforfuturedevelopment.Butapartfromtechnologychallenges,willthemininghaveadisastrousenvironmentimpactonthisredneighbourasithasalreadyhadonEarth?Theachievementsofspaceexplorationarecertainlytobeapplauded.Thecontributionsoftherelatedresearchesonchemistry,medicineandmanyothersarepotentiallylimitless.However,aswelooktoexploringworldsbeyondourown,weneedtobeginnowtolookathistorytoconsiderhowbesttoengagewithdifferentlifeforms,culturesandenvironments.Wemaybecapableofwritingalaw,butwefirstneedtoclearourpotentialinvasiveimpactonanotherplanetthatmaybecompletelydefenseless.Whatdoestheunderlinedword“this”inParagraph2referto?A.ModernAmericansociety. B.Thecreationofconstitution.C.ThesettlementofEuropeans. D.Theexploitationofresources.What’stheauthor’sconcernabouttheexplorationofMars?A.HumanscannotsurviveonMars.B.HumansmaybringnewdiseasestoMars.C.TheexplorationmaydestroyMars’ecosystem.D.TechnologychallengeswillmakeminingonMarshard.What’stheauthor’ssuggestionforfuturespaceexploring?A.Makingrelevantlawsproperly.B.Conductingmorescientificresearches.C.Predictingitsimpactsonotherplanets.D.Learningfrompastexplorationexperiences.Whichcolumnisthistextmostprobablytakenfrom?A.Opinion. B.History.C.Technology. D.Environment.32-35BCDAP058ForestshaveacrucialroleincoolingEarth’ssurfacebyabsorbingCO2likeasponge(海绵).Butonlytwo-thirdsoftheircoolingpowercomesfromtheirabilitytosuckinCO2andstoreit,accordingtoastudybyDeborahLawrence,anenvironmentalscientist.Theotherone-thirdcomesfromthebiophysicaleffects—theirabilitytocreateclouds,dampentheairandreleasecoolingchemicals.Treesintheforestsprovideshade,buttheyalsodampentheairbypullingwaterfromthegroundandreleasingitfromtheirleaves,whichhelpstocoolthesurroundingareainawaysimilartosweating,Lawrencesays.This,inturn,createstherightconditionsforclouds,which,likesnowandiceintheArctic,canreflectsunlighthigherintotheatmosphereandfurthercoolthesurroundings.Treesalsoreleaseorganiccompoundsthatreactwithotherchemicalsintheatmospheretosometimescreateanetcoolingeffect.Toquantify(量化)theseeffects.Lawrenceandhercolleaguescomparedhowthevariouseffectsofforestsaroundtheworldfeedintotheclimatesystem,breakingdowntheircontributionsinrangesoftendegreesoflatitude(纬度).Theresearchersfoundthattheworld’sforestscoolthesurfaceoftheplanetbyaround0.5ºCbecauseofbiophysicaleffectsalone.Threatstorainforestsaredangerousnotonlyfortheglobalclimate,butforcommunitiesthatneighbourtheforests,Lawrencesays.Sheandhercolleaguesfoundthatthecoolingcausedbybiophysicaleffectswasespeciallysignificantlocally.Havingarainforestnearbycanhelptoprotectanarea’sagricultureandcitiesfromheatwaves,Lawrencesays.“Everytenthofadegreemattersinlimitingextremeweather.Andwhereyouhaveforests,theextremesareminimized.”Thisstudyconfirmsthatforestshaveothersignificantwaysofaffectingtheclimatesystem,givingusmorereasonswhydeforestationisbadfortheclimate.Itcouldenablescientiststoimprovetheirclimatemodels,whilehelpinggovernmentstoworkoutbetterconservationandclimatestrategies.Whatdoestheunderlinedword“This”inParagraph3referto?A.Thetreeleavesinforests. B.Theshadeprovidedbytrees.C.Thesurroundingareainforests. D.Thewatercirculationdonebytrees.HowdidLawrencequantifythebiophysicaleffectsofforests?A.Byremovingsomeotherfactors.B.Bycomparingdataofdifferenttimes.C.Bystudyingthecontributionsseparately.D.Bymeasuringthetemperatureindifferentplaces.WhatisthesignificanceofLawrence’sstudy?A.Itdevelopsanewclimatemodel.B.Itmattersinlimitingextremeweather.C.Ithighlightsthedangersofdeforestation.D.Itprovidesascientificbasisforconservationefforts.What’sthebesttitleofthetext?A.Forests:MoreThanaCarbonSpongeB.Forests:TheDisappearingGreenLungC.Forests:MajorPlayersinCarbonCyclesD.Forests:GuardiansofLocalCommunities32-35DCDAP059Agemaybejustanumber,butit’sanumberthatoftencarriesunwantedsideeffects,fromfragilebonesandweakermusclestoincreasedrisksofheartdiseaseandcancer.Now,scientistsattheSalkInstitutehaveshownthattheycansafelyandeffectivelyreversetheagingprocessinmiddle-agedandelderlymicebypartiallyresettingtheircellstomoreyouthfulstates.Aslivingcreaturesage,itisnotjusttheiroutwardappearancesandhealththatchange;everycellintheirbodiescarriesamolecularclock(thatrecordsthepassageoftime.CellsfromolderpeopleoranimalshavedifferentpatternsofchemicalsalongtheirDNA,calledepigeneticmarkers(表观遗传标志物),comparedtoyoungerpeopleoranimals.Scientistsknowthataddingamixtureoffourreprogrammingmolecules—alsoknownas“Yamanakafactors”—tocellscanresettheseepigeneticmarkerstotheiroriginalpatterns.Thisapproachishowresearcherscandialbackadultcells，developmentallyspeaking,intostemcells(干细胞).Inthenewstudy,IzpisuaBelmonte,aprofessorinSalk’sGeneExpressionLaboratory,andhiscolleaguestestedvariationsoftheapproachinhealthyanimalsastheyaged.ThefirstgroupofmicereceivedtheYamanakafactorsfromthetimetheywere15monthsolduntil22months,approximatelyequaltoage50through70inhumans.Anothergroupwastreatedfrom12through22months,approximatelyage35to70inhumans.Andathirdgroupwastreatedforjustonemonthatage25months,similartoage80inhumans.“Whatwereallywantedtoestablishwasthatusingthisapproachforalongertimeissafe,”saysBelmonte.“Indeed,wedidnotseeanynegativeeffectsonthehealth,behaviororbodyweightoftheseanimals.”Comparedtocontrolanimals,therewerenobloodcellchangesinthemicethathadreceivedtheYamanakafactors.Moreover,theteamfoundnocancersinanyofthegroupsofanimals.Whatdoestheunderlinedword“reverse”inParagraph1probablymean?A.Maintain. B.Start. C.Change. D.Quicken.WhatdoweknowabouttheYamanakafactors?A.Theyconsistoffourreprogrammingmolecules.B.Theycanturnepigeneticmarkersintostemcells.C.Theyhavebeenappliedtolowertheriskofheartdisease.D.TheywerediscoveredbyIzpisuaBelmonteandhiscolleagues.WhatisParagraph3mainlyabout?A.Thepurposeofthestudy. B.Theprocedureofthestudy.C.Thebackgroundofthestudy. D.Thesignificanceofthestudy.Whatisthepurposeofthetext?A.Toreporttheresultofacancerstudy.B.Tointroduceacureforagingdiseases.C.Toinformabreakthroughingeneresearch.D.Toexplaintheprocessofkeepingmice