请认真阅读下列短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项。JogginghasbecomethemostpopularindividualsportinAmerica．Manytheoriesevensomem

　　请认真阅读下列短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项。

　　JogginghasbecomethemostpopularindividualsportinAmerica．Manytheoriesevensomemysticaloneshavebeenadvancedtoexplainthepopularityofjogging．Theplaintruthisthatjoggingisacheapquickandefficientwaytomaintainphysicalfitness．

　　Themostusefulsortofexerciseisexercisethatdevelopstheheart，lungsandcirculatory(血液循环的)systems．Ifthesesystemsarefitthebodyisreadyforalmostanysportandforalmostanysuddendemandmadebyworkoremergencies．Onecantrainmorespecificallyasbydevelopingstrengthforweightliftingortheabilitytorunstraightaheadforshortdistanceswithgreatpowerasinfootballbutrunningtrainsyourheartandlungstodeliveroxygenmoreefficientlytoallpartsofyourbody．Itisworthdoingthat：thissortofexerciseistheonlykindthatcanreduceheartdiseasethenumberonecauseofdeathinAmerica．

　　Onlyonesortofequipmentisneeded-apairofgoodshoes．Physiciansadvisebeginningjoggersnottotrytorunintennisorgymshoes．Manydesignadvanceshavebeenmadeinonlythelastseveralyearsthatmakeapairofexcellentrunningshoesindispensable(不可缺少的)ifarunnerwishestodevelopasquicklyaspossible，withaslittlechanceofinjuryaspossible．Apairofgoodrunningshoeswillhavesoftpadsforabsorbingshockaswellasslightlybuilt-upheelsandfullheelcupsthatwillgivethekneeandanklemorestability．Awiseinvestmentingoodshoeswillpreventblisters(水泡)andthefoot，ankleandkneeinjuriesandwillalsoenablethewearertorunonpavedorsoftsurfaces．Nootherspecialequipmentisneeded;youcanjoginanyclothingyoudesireevenyourstreetclothes．

　　Ittakessurprisinglylittletimetodeveloptheabilitytorun．TheAmericanJoggingAssociationhasatwelve-weekprogramdesignedtomovefromafifteen-minutewalk(whichalmostanyonecanmanagewhoisinreasonablehealth)toathirty-minuterun．Ameasureofcommonsenseaphysicalexaminationandaplannedscheduleareallittakes．

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