小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com选择性必修第二册Unit2SportscultureⅠ.阅读理解AAsweage，evenifwe’rehealthy，theheartjustisn’tasefficientinprocessingoxygenasitusedtobe.Inmostpeoplethefirstsignsshowupintheir50sorearly60s.Andamongpeoplewhodon’texercise，thechangescanstartevensooner.“Thinkofarubberband.Inthebeginning，itisflexible，butputitinadrawerfor20yearsanditwillbecomedryandeasilybroken，”saysDr.BenLevine，aheartspecialistattheUniversityofTexas.That’swhathappenstotheheart.Fortunatelyforthoseinmidlife，Levineisfindingthatevenifyouhaven’tbeenanenthusiasticexerciser，gettinginshapenowmayhelpimproveyouragingheart.Levineandhisresearchteamselectedvolunteersagedbetween45and64whodidnotexercisemuchbutwereotherwisehealthy.Participantswererandomlydividedintotwogroups.Thefirstgroupparticipatedinaprogramofnonaerobic(无氧)exercise—balancetrainingandweighttraining—threetimesaweek.Thesecondgroupdidhigh-intensityaerobicexerciseundertheguidanceofatrainerforfourormoredaysaweek.Aftertwoyears，thesecondgroupsawremarkableimprovementsinhearthealth.“Wetookthese50-year-oldheartsandturnedtheclockbackto30-or35-year-oldhearts，”saysLevine.“Andthereasontheygotsomuchstrongerandfitterwasthattheirheartscouldnowfillalotbetterandpump(泵送)alotmorebloodduringexercise.”Buttheheartsofthosewhoparticipatedinlessintenseexercisedidn’tchange，hesays.“Thesweetspotinlifetostartexercising，ifyouhaven’talready，isinlatemiddleagewhentheheartstillhasflexibility，”Levinesays.“Weputhealthy70-year-oldsthroughayear-longexercisetrainingprogram，andnothinghappenedtothematall.”Dr.NiecaGoldberg，aspokeswomanfortheAmericanHeartAssociation，saysLevine’sfindingsareagreatstart.Butthestudywassmallandneedstoberepeatedwithfarlargergroupsofpeopletodetermineexactlywhichaspectsofanexerciseroutinemakethebiggestdifference.1．WhatdoesLevinewanttoexplainbymentioningtherubberband?A．Therightwayofexercising.B．Thecausesofaheartattack.C．Thedifficultyofkeepingfit.D．Theagingprocessoftheheart.2．Inwhichaspectwerethetwogroupsdifferentintermsofresearchdesign?A．Dietplan.B．Professionalbackground.小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.comC．Exercisetype.D．Previousphysicalcondition.3．WhatdoesLevine’sresearchfind?A．Middle-agedheartsgetyoungerwithaerobicexercise.B．High-intensityexerciseismoresuitablefortheyoung.C．Itisnevertoolateforpeopletostarttakingexercise.D．Themoreexercisewedo，thestrongerourheartsget.4．WhatdoesDr.NiecaGoldbergsuggest?A．Makinguseofthefindings.B．Interviewingthestudyparticipants.C．Conductingfurtherresearch.D．Clarifyingthepurposeofthestudy.BMakingday-to-dayactivitiesmoreintenseforafewminutes—suchasbrieflysteppingupthepaceofawalk—couldofferpeoplewhodon’texercisesomeofthehealthbenefitsthatexercisersenjoy，accordingtoanewstudyofroughly25,000adultswhoreportednoexerciseintheirfreetime.Thosewhoincludethreeone-totwo-minuteburstsofintenseactivityperdaysawanearlya40percentdropintheriskofdeathfromanycausecomparedwiththosewithoutsuchactivity.Theriskofdeathfromcanceralsofellbynearly40percent，andtheriskofdeathfromcardiovascular(心血管的)diseasedroppedalmost50percent，researchersreportonlineDecember8inN...