高考阅读理解C篇集训（二）

高考阅读理解C篇集训（二）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。P011Humansproducemorethan300milliontonsofplasticeveryyear.Almosthalfofthatwindsupinlandfills,andupto12milliontonspollutetheoceans.Sofarthereisnoeffectivewaytogetridofit.butanewstudysuggestsananswermaylieinthestomachsofsomehungryworms.ResearchersinSpainandEnglandrecentlyfoundthatthewormsofthegreaterwaxmothcanbreakdownpolyethylene(聚乙烯)，whichaccountsfor40%ofplastics.Theteamleft100waxwormsonacommercialpolyethyleneshoppingbagfor12hours,andthewormsconsumedandbrokedownabout92milligrams,oralmost3%ofit.Toconfirmthattheworms’chewingalonewasnotresponsibleforthepolyethylenebreakdown,theresearchersmadesomewormsintopaste(糊状物)andappliedittoplasticfilms.14hourslaterthefilmshadlost13%oftheirmass—apparentlybrokendownbyenzymes(酶)fromtheworms’stomachs.TheirfindingswerepublishedinCurrentBiologyin2017.FedericaBertocchini.co-authorofthestudy,saystheworms’abilitytobreakdowntheireverydayfood—beeswax—alsoallowsthemtobreakdownplastic.“Waxisacomplexmixture,butthebasicbondinpolyethylene,thecarbon-carbonbond,isthereaswell,”sheexplains,“Thewaxwormevolvedamethodorsystemtobreakthisbond.”JenniferDeBruyn,amicrobiologistattheUniversityofTennessee,whowasnotinvolvedinthestudy,saysitisnotsurprisingthatsuchwormscanbreakdownpolyethylene.Butcomparedwithpreviousstudies,shefindsthespeedofbreakingdowninthisoneexciting.Thenextstep,DeBruynsays,willbetoidentifythecauseofthebreakdown.Isitanenzymeproducedbythewormitselforbyitsgutmicrobes(肠道微生物)?Bertocchiniagreesandhopesherteam’sfindingsmightonedayhelpemploytheenzymetobreakdownplasticsinlandfills.Butsheexpectsusingthechemicalinsomekindofindustrialprocess—notsimply“millionsofwormsthrownontopoftheplastic.”Whatcanwelearnaboutthewormsinthestudy?A.Theytakeplasticsastheireverydayfood.B.Theyarenewlyevolvedcreatures.C.Theycanconsumeplastics.D.Theywindupinlandfills.AccordingtoJenniferDeBruyn,thenextstepofthestudyisto__________.A.identifyothermeansofthebreakdownB.findoutthesourceoftheenzymeC.confirmtheresearchfindingsD.increasethebreakdownspeedItcanbeinferredfromthelastparagraphthatthechemicalmight__________.A.helptoraiseworms B.helpmakeplasticbagsC.beusedtocleantheoceans D.beproducedinfactoriesinfutureWhatisthemainpurposeofthepassage?A.Toexplainastudymethodon worms. B.Tointroducethedietofaspecialworm.C.Topresentawaytobreakdownplastics. D.Toproposenewmeanstokeepeco-balance.28-31CBDCP012TheLEGOGroup,whoseplasticbuildingtoysarefamiliartomanypeople,hasbeenworkingonmakingLEGObricksoutofrecycledplastic.Thebricksaren’treadyyet,butthecompanysaysit’smakingprogress.Sinceroughly1960,LEGObrickshavebeenmadefromABSplasticwhichmakesLEGObricksverytoughandgivesthemgreatclutchpowersothatthethingsusersbuilddon’tfallaparteasily.Sadly,ABSplasticcan’treallyberecycledandittakesanextremelylongtimetobreakdown.However,since2015,LEGOhasbeentryingtomakeearth-friendlyproducts.Makingbricksfromrecycledmaterialscouldcutpollutionfromthecompany’sbricksby70%.Butmakingbricksoutofrecycledplasticischallenging.ThegoalistomakebricksoutofPETplastic,whichissofterthanABSplasticandcanbefoundinthingslikebottlesandclothing.Arecycledone-literplasticbottlecouldmakeaboutten2×4LEGObricks.Overthepastthreeyears,thecompanyhastestedover250differentwaysofcreatingLEGObricksfromrecycledplastic.Ateamofmorethan150peopleareworkingontheproblem.TimBrooks,whofocusesonenvironmentalresponsibilityatLEGO,saysthatexperimentingandfailingis“animportantpartoflearning”.Now,thecompanysaystheycanmakeagood2×4brickfromPET.OneimportantstepwasfindingawayofaddingthingstoPETplastictomakeittougherandgiveitbetterclutchpowerlikeABS.Theywillalsoworkonshapingbricksintootherformsandaddingcolortothem--rightnowtheyarejustwhite.Thebrickswillgothroughmanydifferenttests,whichwilltakeatleastayear.Thecompanyaimstomakealltheirmainproductsoutofsustainablematerialsbytheyear2030.“Weknowkidscareabouttheenvironmentandwewanttotellthemwe’reworkingonit.”saidMr.Brooks.WhichofthefollowingcanbestdescribeLEGObricksmadefromABSplastic?A.Strongandfirm. B.Recyclableandsoft.C.Cheapandfamiliar. D.Popularandnew.WhyisLEGOworkingonmakingPETplasticbricks?A.Becausethecompanywantstoshowthatit’smakingprogress.B.BecausethishasalwaysbeenLEGO’sgoalsinceitsfoundation.C.BecauseusingPETplasticbrickscanreducepollutiontotheearth.D.BecausePETplasticbricksaremuchsofterandcheaper.WhatcanwelearnaboutmakingPETplasticbricks?A.LEGOhasfoundawaytomakecolorfulPETplasticbricks.B.It’snotnecessarytoputthingsintoPETplastictomakeittough.C.Alotoftestshavebeencarriedoutandtherewillbemoretests.D.ChildrenkeepaskingthecompanytoreplaceABSplasticbricks.Whichofthefollowingcanbethebesttitleforthetext?A.LEGObecomesaleadingtoycompanyB.LEGOworkstomakebricksfromrecycledplasticC.LEGOrecyclesplastictoybrickstoprotecttheenvironmentD.LEGOmakesthebestofABSplastictoreducecost28-31ACCBP013Herbsareamongthemostusefulplantsinnature.Weusethemnotonlyinfoodandmedicines,butwealsousetheminskincareproducts,orevenusethemtohelpmaketheairsmellpleasant.Buthumansarenotonlycreaturesthatloveherbs.Bees,butterfliesandotherinsectslovethemaswell,andsodosomebirds.Aplantscientist,DavidTrinklein,Missouri,saidthatpeople’sinterestinherbshasbeengrowingandherbsalesareontherise.Peopleareusingfreshgardenherbsforcooking,buttheirotherinterestinherbsistosupportpollinators(传粉者)—creaturesthathelpplantstoreproduce.Beepopulations,forexample,havebeenshrinkinginmanyareas,forwhich,scientistssaypesticidesandclimatechangeareamongthemaincauses.Manygardenersaretryingtohelppollinatorpopulationsbygivingthemtheplantstheyneedtobehealthy.Trinkleinsaidthatherbswiththemostnectar(花蜜)bringbeestothegarden.Sonectar-filledherbssuchaslemonbalmandlavenderaresuggested.Bees—especiallyhoneybees—findflowersbytheircolor,nottheirsmell,notesDavidSalman,founderofagardeningsupplycompany.Ingeneral,annualherbsaremoreimportantforbutterflies.Annualherbsareplantsthatmustbereplantedeachyear.Beesmustcollectnectarfromearlyspringthroughtolateautumntosupportahealthybeegroup.Thatmeansgardenersshouldplantmanykindsofflowersandherbstolengthenthefloweringseason.Manybeekeepersbelievethatherbsusedforbringinginpollinatorsshouldbenativetoanarea.ButTrinkleindisagrees.“Idon’tthinkabeemindsifaherbisnativeornon-native,”hesaid.Gardenerswhowishtohelppollinatorscanconsiderplantinggardensmadeupcompletelyofherbs.“Theycanmakeyourhomesmellwonderfulandsupplynutrientstobees,”hesaid.However,Trinkleinadvisesgardenersagainstwearingstrong-smellingperfumes(香水)andhairproducts.Whatisthefirstparagraphmainlyabout?A.Therolethatherbsplayinourdailylife.B.Thereasonwhyweshouldpaymoreattentiontobees.C.Thefactthatmostbeesrelyonherbstosurvive.D.Theimportanceofherbstobothhumansandothercreatures.Howhavebeepopulationsbeeninmanyareas?A.Theyhavebeenincreasing.B.Theyhavenotchangedsomuch.C.Theyhavebeenbecomingsmallerandsmaller.D.Theyhavebeenturningmoreandmorehealthier.Howcanhumanbeingshelpbees?A.Byusingmorepesticidestoprotectherbsfrominsects.B.Byonlyplantingmoreannualherbswhichbeesarefondof.C.Bywearingstrong-smellingperfumesintheirgardentoattractbees.D.Bygrowingdifferentkindsofflowerstoprovidealongerfloweringseason.WhatisDavidTrinklein’sadviceonplantingherbstohelpbees?A.Plantingnativeherbsratherthannon-nativeones.B.Raisingpeople’sinterestinplantingandsellingherbs.C.Avoidingplantingherbsinwinterwhentheyseldomgiveflowers.D.Choosingmorenectar-filledherbstoprovidebeeswithnutrients.28-31DCDDP014AI,5G,cloudcomputingandotherdigitaltechnologiesarenotonlychangingourlivesbutshapingtheeconomyaswell.China’ssixmajorcommercialbanksaresteppingupdigitalwalleteffortstoprovidenewdriveforthee-CNY(数字人民币)trialsinthecountry,asreportedbyShanghaiSecuritiesNewsonMarch23.“Thefunctionsandpropertiesofe-CNYareexactlythesameasthoseofthepapercurrency,exceptthattheformisdigital,”saidMuChangchun,headofthePeople’sBankofChina’sDigitalCurrencyResearchInstitute.Manypeoplearepuzzledbye-CNYandelectronicpayments.“Digitalcurrencyhasthecharacteristicsofbothpapermoneyandelectronicpayment,”saidWuQianhong,aprofessorattheSchoolElectronicandInformationEngineering,BeihangUniversity.“Intheory,digitalcurrencycanreplacepapermoney,AlipayandWeChatpayments.”ComparedwithAlipayandWeChatpayments,e-CNYfeaturesanonymity(匿名信)andsecurity.E-commerceplatformsthatacceptpaymentsviae-CNYwillnothaveaccesstouser’spersonalinformation.E-CNYuserscanopenananonymousdigitalwalletbyregisteringamobilephonenumber,andtelecomoperatorscannotdisclosecustomerinformationtothecentralbankoranythird-partyinstitutions.Munotedthate-CNYusers’privacyprotectionisatthehighestlevelamongalltheexistingpaymenttools.SimilartoAlipayandWeChatpayments,usinge-CNYrequiresanaccount.Afterobtainingtheotherparty’saccountnumber,userscanentertheamountofdigitalmoneytotransferandthenenterthepaymentpasswordtocompletethetransaction(交易).However,theprocessbehindthesetransfersaredifferent.Forelectronicpayments,thetransferhastogothroughathirdparty,andthereceiverswillgetthetransferredmoneyonlywhentheywithdrawmoneyfrombanks.Bute-CNYtransfersonlyneedapayerandareceivertocompleteatransaction.Therefore,itguaranteesrisk-freepayments,accordingtoWu.Insimpleterms,e-CNYcanbeconsidered“money”,whileelectronicpaymentsarelike“wallets”.Whatcanweknowaboute-CNY?A.Itisissuedbysixmajorcommercialbanks.B.Itcombinespapermoneyandelectronicpayment.C.ItisdesignedtoreplaceAlipayandWeChatpayments.D.Ithasexactlythesamefunctionasotherpaymenttools.Howdoese-CNYprotectusers’privacy?A.Bylimitingaccesstopersonalinformation.B.Bystoringpersonaldatainthecentralbank.C.Byopeningauniquedigitalwalletforeachuser.D.Bylinkingtelecomoperatorstoamobilephonenumber.WhatcanbeconcludedfromParagraph6?A.E-CNYtransfersrequiretogothroughathirdparty.B.E-CNYismoreconvenientthanotherelectronicpayments.C.E-CNYcanbetransferredwithoutthereceiver’sinformation.D.E-CNYandelectronicpaymentsensuresecurityinthesameway.What’sthemainpurposeofthetext?A.Topromotetheuseofe-CNY.B.Toinformreadersofe-CNY.C.Tocomparedifferenttypesofpayments.D.Todescribetheimpactofdigitaltechnologies.28-31BABBP015ThefirsttimeIusedtheTVtodistractmydaughter,Ifeltlikeabadparent.IconvincedmyselfIwasa“bad”mom—thesedaysIbelievetheoppositetobetrue.Screentimemakesmeabettermom.NowIknowwhatmostofyoumightbethinking:That’sridiculous.Onlycrappy(糟糕的)parentsrelyonthescreentocarefortheirkids.Thenagain,expertssuggestparentslimitmediause.AndwhileIdonotdoubtexperts,therearethingstheyfailtoconsider.Likemost6-year-olds,mydaughtergetsworkedupandexcitedeasilyandwatchingacartoongivesherachancetoshutoffhermind.Andthereareotherreasons—moreselfishreasons.Iamawork-from-workmom,andgivingherscreentimegivesme“me”time.I’mabletowritewhileshewatchesTV.Andwhilethismaysoundbad,IbelieveIamhelpingmydaughterrealizesheshouldrelyonherself.WhenMommyworks,shegetsherownsnacks,drinksandtoys.Thereareotherbenefits,too.TVhasalsotaughtmydaughter.Thanksto“superWhy”,sheknewheralphabetat2,andthanksto“SesameStreet”,shewasabletocountto20byage3.AndIusethescreenasagreatincentive.Mydaughterearns“tabletime”whenshecompletestasks,e.g.,makingherbedearns15minuteswhiledoingherhomeworkgetsher30.Ofcourse,Ihaveafewrules.Duringmeals,theTVisoff;allprogramsmustbesupervised;onweekdays,sheislimitedtotwohoursmaximum.Soremember:Itdoesn’tmatterwhatourkidswhichitmatterswhattheydo,whattheysay,whattheyfeelandhowtheyact,andonlyyouknowwhatisbestforthem.Whatcanbelearnedabouttheauthor’sopinionaboutscreentime?A.Itfailstotakekidsintoconsideration. B.Itiswelcomebymostcrappyparents.C.Itchallengesapopularbelief. D.Itisinlinewithexperts.HowCanwhentimebegoodforkidswhosemothersworkathome?A.Itgivesthemtopicstodiscusswithfriends.B.Itgivesthemsomeuninterruptedtime.C.Itenablesthemtokeeptheirspiritsup.D.Ithelpsthembecomeindependent.Whatdoestheunderlinedword“incentive”inParagraph4mostprobablymean?A.Motivator B.Relaxation C.Ideaproducer D.LearningtoolWhichofthefollowingmighttheauthoragreewith?A.Scienceandtechnologyareprimaryproductiveforces.B.Amanisgood-for-nothing(无用之人)untilheiseducated.C.Nothingcanbeaccomplishedwithoutrules.D.Eachcoinhastwosides.28-31CBADP016ByCUIJIA|ChinaDaily|Updated:2022-02-12SnowboardingpioneerShaunWhitetookhisfinalbowatthebottomofthehalfpipecourse(U型槽)attheBeijing2022OlympicWinterGamesonFriday,officiallymarkingtheendofhislongandstoriedcareerasaprofessionalsnowboarder.Nomatterhowhardthe35-year-oldtriedtoholdbackhisemotions,itjustgottobetoomuch.Althoughhewantedtodohisbestbyperformingtwo1440sduringhisfinalrun,hefellwhileattemptinghisseconddoublecork1440.Despitethefall,everyonecheeredforthesnowboardinglegendatGentingSnowParkinZhangjiakouashestoodbackupandcontinueddownthehalfpipe.“Slidingonmyback,Iwasthinking,thisisn’thowIwantedittogo.Youdon’talwaysgetwhatyouwant,butIhavetobethankfulforeverythingIdohaveandwhatIhavegotteninmycareerandthat’swhyI’mveryemotional.Ican’tbelieveit’sover.It’swild,”saidWhite,whofinishedinfourthplace.Fromayoungage,snowboardingwaswhatWhitewantedtodomorethananything.At19,WhitetookpartinhisfirstWinterOlympicsinTurinin2006andscoredgold.Thevictorychangedhislifeforeverandhebecamethesport’sglobalsuperstar.Meanwhile,hecontinuedtopushhislimitsbylandingthefirstdoublecorkinhalfpipeandinventingthedoubleMcTwist1260.ThosetricksbroughthimthreeOlympicgoldmedals,aswellasinjuries,includingthebrutal(残酷的)crashin2018whenheslammedhisheadagainstthetopofasuperpipe,leadingto62stitches(缝合)inhisfaceinthelead-uptothePyeongchang2018WinterOlympics.“‘I’mnotcompeting’doesn’tmeanIwon’tbehereatthenextWinterOlympicscheeringonallmyfriends,”hesaid.“Thefutureformeissoexciting.Thereissomuchtodoandsomuchtolivefor.Thisisjustthebeginningforme.”WhatdidWhitefeelwhenhefinishedthecompetition?A.Hewasworriedabouthisfuture.B.Hewasproudofhisprofessionalcareer.C.Hewasdoubtfulabouttheresultofthecompetition.D.Hewassatisfiedwithwhathehaddoneinthecompetition.WhydoestheauthormentionWhite’sseriousinjuriesinparagraph4?A.Toexplainwhyheretired.B.Todescribetherulesofsnowboarding.C.Toshowthehardshipbeforehissuccess.D.Towarnaboutthepossiblerisksofsnowboarding.WhatcanbeinferredaboutShaunWhitefromthelastparagraphs?A.HewillcompeteinthenextWinterOlympics.B.Hewillcontinuetocontributetotheice-snowsports.C.Hewon’ttalkabouthisearlyachievementsanymore.D.Hewilltryhisbesttomakemorefriendsinthefuture.Whichofthefollowingcanbethebesttitleforthetext?A.FinalPerformanceB.EmotionalGoodbyeC.HowtoBeaGreatSnowboarderD.Snowboarding-theWorld’sMostDangerousSport08-11BCBBP017Throughouthistory,manyspeciesofanimalshavebeenthreatenedwithextinction.WhenEuropeansfirstarrivedinNorthAmerica,morethan60millionbuffalo(水牛)livedonthecontinent.Yethuntingthebuffalowassopopularduringthe19thcenturythatby1900theanimal’spopulationhadfallentoabout400beforethegovernmentsteppedintoprotectthespecies.Insomecountriestoday,theelephantfacesasimilarchallenge,asillegalhunterskilltheanimalsfortheivoryintheirtusks.Yetnotallanimalswithcommercialvaluefacethisthreat(威胁).Thecow,forexample,isavaluablesourceoffood,butnooneworriesthatthecowwillsoonbeextinct.Whydoesthecommercialvalueofivorythreatentheelephant,whilethecommercialvalueofbeefprotectsthecow?Thereasonisthatelephantsareacommonresource,whilecowsareprivategoods.Elephantswanderfreelywithoutanyowners,Thehunterhasastrongmotivationtokillasmanyelephantsashecanfind.Becauseillegalhuntersarenumerous,eachhas’onlyaslightmotivationtopreservetheelephantpopulation.Bycontrast,cattleliveonfarmsthatareprivatelyowned.Eachfarmermakesgreatefforttomaintainthecattlepopulationonhisfarmbecauseheharveststhebenefitoftheseefforts.Governmentshavetriedtosolvetheelephant’sproblemintwoways.Somecountries,suchasKenyaandUganda,havemadeitillegaltokillelephantsandselltheirivory.Yettheselawshavebeenhardtoputintoeffect,andelephantpopulationshavecontinuedtodwindle.Bycontrast,othercountries,suchasMalawiandNamibia,havemadeelephantsprivategoodsandallowedpeopletokillelephants,butonlythoseontheirownproperty.Withprivateownershipandtheprofitmotivenowonitsside,theAfricanelephantmightsomedaybeassafefromextinctionasthecow.TheancientGreekphilosopherAristotlepointedouttheproblemwithcommonresource:“Whatiscommontomanyistakenleastcareof,forallmenhavegreaterregardforwhatistheirownthanforwhattheypossessincommonwithothers.”Whydoestheauthormentionbuffaloinparagraph1?A.Tointroduceasimilarthreattoelephants.B.Toprovideanexampleofspeciesextinction.C.Toofferanexplanationforgovernmentpolicies.D.TopresentthestatisticsofthebuffaloinAmerica.Whydoelephantsfacethreatswhilecowsaresafe?A.Theyareunderdifferentlawprotection.B.Theyattractdifferentgroupsofhunters.C.Theycontaindifferentcommercialvalue.D.Theyrepresentdifferentownershiptypes.Whatisparagraph4mainlyabout?A.Bansonkillingelephantsforivory.B.Effectivelawsforelephantprotection.C.Methodsofmakingelephantsprivategoods.D.Governmentpoliciesontheelephant’sproblem.WhatcanwelearnfromAristotle’swords?A.Peopleholdlittleregardforothers’property.B.Peoplewanttoprofitfromcommonresources:C.Peoplecaremoreabouttheirownpossession.D.Peopletendtolakewhattheyownforgranted.28-31ADDCP018Feelingoverloadedbyyourto-dolistcancertainlymakeyouunhappy,butnewresearchsuggeststhatmorefreetimemightnotbetheelixirmanyofusdreamitcouldbe.Inanewstudyreleasedlastweek,researchersanalyzeddatafromtwolarge-scale(大规模)survey’sabouthowAmericansspendtheirtime.Together,thesurveysincludedmorethan35,000respondents?Theresearchersfoundthatpeoplewithmorefreetimegenerallyhadhigherlevelsofsubjectivewell-being—butonlyuptoapoint.Peoplewhohadaroundtwohoursoffreetimeadaygenerallyreportedtheyfeltbetterthanthosewhohadlesstime.Butpeoplewhohadfiveormorehoursoffreetimeadaygenerallysaidtheyfeltworse.Soultimatelythefreetime“sweetspot”mightbetwotothreehoursperday,thefindingssuggest.Partoffindingthisseeminglytricky“sweetspot”hastodowithhowpeoplespendtheextratimetheyhave,theresearchersbehindthenewstudyargue.Theyconductedseveralsmalleronlineexperiments.Inonetheyaskedparticipantstoimaginehaving3.5to7freehoursperday.Theywereaskedtoimaginespendingthattimedoing“productive”things(likeexercising)ortoimaginedoing“unproductive”activities(likewatchingTV).Studyparticipantsbelievedtheirwell-beingwouldsufferiftheyhadalotoffreetimeduringtheday—butonlyiftheyuseditunproductively.Thoughthatexperimentwashypothetical,whichisonelimitationofthenewresearch,it’scertainlyinlinewithotherresearchshowingthatbeinginastateof“flow”canbegoodforpeople’smentalhealth.Ofcourse,whatfeels“productive”isuptoyou.Manytraditionallyproductiveorpurposefulactivitiescanbeeasyandfun.Engaginginabitoflow-keycardio,likewalkingandjogging,canhelpburnstress.Free-timeactivitieslikereadingorcookingarealsoknowntoputpeopleinastateofflow.Whatdoestheunderlinedword“elixir”inparagraph1referto?A.Magicsolution. B.Physicalpower.C.Psychologicaltest. D.Relaxedatmosphere.Howdidtheresearcherscarryoutthenewstudy?A.Bydoinglarge-scaleonlinesurveys.B.Bygivinginterviewsandmentaltests.C.Bycomparingrespondents’backgrounds.D.Byconductingexperimentsandanalyzingdata.Whatisadistinctfindingofthenewresearch?A.Doingunproductivethingsleadstounhappiness.B.Beinginastateofflowbenefitspeople’smentalhealth.C.Man’swell-beingispositivelyrelatedtothefreetimetheyhave.D.Howpeoplespendtheirfreetimeaffectstheirsenseofwell-being.Whatisthefocusofthelastparagraph?ATheimportanceofburningstress.B.Easyandfunactivitiestokilltime.C.Furtherexplanationofbeingproductive.D.Thebenefitsofengaginginfree-timeactivities.28-31ADBCP019Endangeredpolarbearsarebreeding(繁殖)withgrizzlybears(灰熊),creating“pizzly”bears,whichisbeingdrivenbyclimatechange,scientistssay.AstheworldwarmsandArcticseaicethins,starvingpolarbearsarebeingforcedeverfurthersouth,wheretheymeetgrizzlies,whoserangesareexpandingnorthwards.Andwiththatgrowingcontactbetweenthetwocomeincreasinghybrids(杂交种).Withcharacteristicsthatcouldgivethehybridsanadvantageinwarmingnorthernhabitats,somescientistsguessthattheycouldbeheretostay.“Usually,hybridsaren’tbettersuitedtotheirenvironmentsthantheirparents,butthesehybridsareabletosearchforabroaderrangeoffoodsources,”LarisaDeSantis,anassociateprofessorofbiologicalsciencesatVanderbiltUniversity,toldLiveScience.Theriseof“pizzly”bearsappearswithpolarbears’decline:theirnumbersareestimatedtodecreasebymorethan30%inthenext30years.Thissuddenfallislinkedpartlyto“pizzly”bearstakinguppolarbears’ranges,wheretheyoutcompetethem,butalsotopolarbears’highlyspecializeddiets.“PolarbearsmainlyconsumedsoftfoodsevenduringtheMedievalWarmPeriod,apreviousperiodofrapidwarming,”DeSantissaid,referringtofatmealssuchasseals.“Althoughallofthesestarvingpolarbearsaretryingtofindalternativefoodsources,likeseabirdeggs,itcouldbeatippingpointfortheirsurvival.”Actually,thecaloriestheygainfromthesesourcesdonotbalanceoutthosetheyburnfromsearchingforthem.Thiscouldresultinahabitatreadyforthehybridstomoveinandtakeover,leadingtoalossinbiodiversityifpolarbearsarereplaced.“We’rehavingmassiveimpactswithclimatechangeonspecies,”DeSantissaid.“Thepolarbearistellingushowbadthingsare.Insomesense,‘pizzly’bearscouldbeasadbutnecessarycompromisegivencurrentwarmingtrends.”Whydopolarbearsmovefurthersouth?A.Tocreatehybrids. B.Toexpandterritory.C.Torelievehunger. D.Tocontactgrizzlies.Whatmakes“pizzly”bearsadapttonaturalsurroundingsbetterthantheirparents?A.Broaderhabitats. B.Morefoodoptions.C.Climatepreference. D.Improvedbreedingability.Whatdoestheunderlinedphrase“atippingpoint”inparagraph5referto?A.Ararechance. B.Acriticalstage.C.Apositivefactor. D.Aconstantchange.What’sthemainideaofthetext?A.Polarbearsarechangingdietsforclimatechange.B.Polarbearshavealreadyadjustedtoclimatechange.C.“Pizzly”bearsareontherisebecauseofglobalwarming.D.“Pizzly”bearshavereplacedpolarbearsforglobalwarming.28-31CBBCP020Businessmeetingsare,arguably,anecessarypartofanyorganisationwherepeopleworkcollectivelytoaccomplishagoal.Butbadlymanaged,meetingscanbeunproductive,boringandfeellikeacompletewasteoftime.Inarecentsurveyconductedbygovernancet