阅读理解Aspeoplecontinuetogrowandageourbodysystems(系统)continuetochange．Atacertainpointinyourlifeyourbodysystemwillbegintoweaken．Yourstrengthmaybecomeweaker．Itmay

　　阅读理解

　　Aspeoplecontinuetogrowandageourbodysystems(系统)continuetochange．Atacertainpointinyourlifeyourbodysystemwillbegintoweaken．Yourstrengthmaybecomeweaker．Itmaybecomemoredifficultforyoutoseeandhear．Theslowchangeofagingcausesourbodiestolosesomeoftheirabilitytobouncebackfromdiseaseandinjury．Inordertolivelongerwehavealwaystriedtosloworstopthischangethatleadsustowardtheendofourlives．

　　Manyfactors(因素)decideyourhealth．Agooddietplaysanimportantrole．Theamountandtypeofexerciseyougetisanotherfactor．Yourlivingconditionisyetanother．Butscientistsstudyingagingproblemwanttoknow：Whydopeoplegrowold?Theyhopethatbystudyingtheagingmedicalsciencetheymaybeabletomakethelengthoflifelonger．

　　Thereisnothingtobeafraidofasoldagecomes．Manyconsiderthelaterpartoflifetobethebesttimeforliving．Physicalactivitymaybecomelessbutoftenyougetbetterunderstandingofyourselfandtheworld．

　　Whatweconsideroldagenowmayonlybemiddle-agedsomedaysoon．Whoknowswithsomanyadvancesinmedicalsciencehappeningsoquicklylifelengthmayonedaybemeasuredincenturiesratherthaninyears!

　　(1)

　　Whenpeoplebecomeagingtheywilllosesomeoftheirabilitytobouncebackfromdiseaseandinjury“bounceback”heremeans________．

　　[]A．

　　toescapefromdiseaseandinjury

　　B．

　　toimproveone'shealthafterone'sdiseaseandinjury

　　C．

　　tojumpbackward

　　D．

　　torunfast

　　(2)

　　Inordertolivelonger________．

　　[]A．

　　wehavetotrytoimproveourfood

　　B．

　　weshouldtry