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2023名校版高考英语阅读理解精读含答案Asweageevenifwerehealthytheheartjustisntasefficientinprocessingoxygenasitusedtobe.Inmostpeoplethefirstsignsshowupintheir50sorearly60s.Andamongpeoplewhodontexercisethechangescanstartevensooner.“Thinkofarubberband.Inthebeginningitisflexiblebutputitinadrawerfor20yearsanditwillbecomedryandeasilybroken/7saysDr.BenLevineaheartspecialistattheUniversityofTexas.ThatswhathappenstotheheartFortunatelyforthoseinmidlifeLevineisfindingthatevenifyouhaven7tbeenanenthusiasticexercisergettinginshapenowmayhelpimproveyouragingheart.Levineandhisresearchteamselectedvolunteersagedbetween45and64whodidnotexercisemuchbutwereotherwisehealthy.Participantswererandomlydividedintotwogroups.Thefirstgroupparticipatedinaprogramofnonaerobic(无氧)exercise-balancetrainingandweighttraining-threetimesaweek.Thesecondgroupdidhigh-intensityaerobicexerciseundertheguidanceofatrainerforfourormoredaysaweek.Aftertwoyearsthesecondgroupsawremarkableimprovementsinhearthealth.“Wetookthese50-year-oldheartsandturnedtheclockbackto30-or35-year-oldhearts“saysLevine.Andthereasontheygotsomuchstrongerandfitterwasthattheirheartscouldnowfillalotbetterandpump(泵送)alotmorebloodduringexercise/7Buttheheartsofthosewhoparticipatedinlessintenseexercisedidnztchangehesays./zThesweetspotinlifetostartexercisingifyouhaventalreadyisinlatemiddleagewhentheheartstillhasflexibility/7Levinesays.Weputhealthy70-year-oldsthroughayearlongexercisetrainingprogramandnothinghappenedtothematall.”Dr.NiecaGoldbergaspokeswomanfortheAmericanHeartAssociationsaysLevine7sfindingsareagreatstart.Butthestudywassmallandneedstoberepeatedwithfarlargergroupsofpeopletodetermineexactlywhichaspectsofanexerciseroutinemakethebiggestdifference.WhatdoesLevinewanttoexplainbymentioningtherubberbandTherightwayofexercising.Thecausesofaheartattack.Thedifficultyofkeepingfit.TheagingprocessoftheheartInwhichaspectwerethetwogroupsdifferentintermsofresearchdesignDietplan.Professionalbackground.Exercisetype.Previousphysicalcondition.WhatdoesLevine7sresearchfindMiddle-agedheartsgetyoungerwithaerobicexercise.High-intensityexerciseismoresuitablefortheyoung.Itisnevertoolateforpeopletostarttakingexercise.Themoreexercisewedothestrongerourheartsget.WhatdoesDr.NiecaGoldbergsuggestMakinguseofthefindings.Interviewingthestudyparticipants.Conductingfurtherresearch.Clarifyingthepurposeofthestudy.dcacAnewstudyshowsthatincreasesinextremewinterweatherinpartsoftheUSarelinkedtoquickenedwarmingoftheArctic.OverthepastfourdecadeswarmingintheArctichasbeenfarmoredefinitethanthatintherestoftheworldandhascausedarapiddecreaseofsummerseaice.HeatingintheArctichasultimatelydisturbedthecircularpatternofwindsknownasthepolarvortex(旋涡).Asaresultitgotstretchedoutofshapeandslidsouthwardoffthepole.ScientistsbelievethisvortexstretchingprocessledtothedeadlyTexascoldwaveinFebruarythisyear.“ThepolarvortexovertheArcticusuallylocksincoldairatthepolesanddoesnoteasilymovesouth.Thestrongerthewindsthemoretheairinsideiskeptandthecolderitgets“explainedleadresearcherDr.JudahCohenwho7saprofessorattheMassachusettsInstituteofTechnology.MeltingiceintheArcticandrisingtemperaturescandisturbtheArcticvortexmakingcoldairnolongerlockedintheArcticbutmovesomefarthersouth/7TheresearcherssaythattheirfindingsarebasedonbothobservationsandmodellingandtheyshowaphysicallinkbetweenclimatechangeintheArcticthestretchingofthepolarvortexandtheimpactsonground.Theresearchersbelievetheirworkcouldimprovepredictionsaboutthebeginningofextremecoldwinterevents.Theresearchteamalsobelievesthattheirfindingswillhelppeopleunderstandthatglobalwanningiscomplexandperhapsletgooftheideathatcolderwintersmeanclimatechangeisnthappening./zInthepastthesecoldextremesovertheUSandRussiahavebeenusedtojustifynotreducingcarbonbuttheresnolongeranyexcusenottostartreducingemissionsrightaway saidDr.Cohen.Whatisparagraph2mainlyaboutTheexplanationgivenbyscientists.TheformationofTexascoldwave.Thedecreaseofsummerseaice.Thepolarvortex7sbeingdisturbed.WhatisthefunctionofpolarvortexPreventingcoldairfromescaping.Helpingcoldairmovefreely.Acceleratingthemeltingofice.Makingthewindstronger.WhatcanbeinferredfromthelastparagraphGlobalwarmingmerelycausesunnecessaryfear.Weather-gone-wildpatternisafantasy.Reducingemissionsisapressingmatter.There7snolongeranyexcusenottostartreducingemissions.InwhichcolumnofawebsitecanthetextprobablybefoundA.EntertainmentB.Tourism.C.Education.D.Environment.。