---------------------------------作者:_____________-----------------------------日期::_____________大学体验英语综合教程第三版2unit6---------------------------------------------------------------------编制:---------------------------------------------------------------------日期:U6P1LeadinPhysicalactivityimprovesourbodies',suggeststhatmaintainingahealthylevelofphysicalfitnessthroughexercisecanhelppeoplelivelonger;andthefindingsalsoprovideupdatedsupporttoCharlesDarwin's"survivalofthefittest",leadingtodiscouragement,frustration,,however,-andincreaseone'sphysicalactivitywhileprovidingsocialinteraction,,Greece,andthenbroughttoBoston,Massachusettsin1897,,usuallya40k()race,ingincreasinglypopularwithbothmenandwomenforitschallengeofperseverance,requiringbothphysicalandmentalendurance,-timerunnersitistheculminationofadream-':
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