Weallknowthatexerciseisgoodforyourhealth.Butsomekindsofexercisemaybebetterthanothers.Runningforexamplemayhelptoprotectagainstheartdiseaseandotherhealthproblems.Runningmayalsohelpyoulivelonger.Recently
Weallknowthatexerciseisgoodforyourhealth.Butsomekindsofexercisemaybebetterthanothers.Runningforexamplemayhelptoprotectagainstheartdiseaseandotherhealthproblems.Runningmayalsohelpyoulivelonger.
Recentlyresearchersstudiedmorethan55000adults.Aboutaquarteroftheadultshaveagoodhabitofrunning.Thestudyfoundtheserunnersweremuchhealthierthannon-runners.Infacttherunnersliveonaverage(平均)，threeyearslongerthanthenon-runners.
Runningmaybegoodexercisebutitcanbedifficultonthebody.Herearecommonlysharedideasamongfitness坪perts(健身专家)tolowertheriskofinjury(受伤)forpeoplewhoarenewtorunning.
Takeiteasy.
notruntoomuchtoosoonortoofast.Mostpeoplegetrunriinginjuripivhentheypushthemselvestoohard.Thebodyneedstimet抒參tusedtoincreasesindistance(距离)orspeed.
Getgooditiniiingshoes.
Thereisnosinglebestshoeforeveryrunner.Youshouldfindtheshoesthatofferthebestfitandsupportforyourfeet.Moreimportantlyyoushouldhaveanewpairofshoesevery500to800kilometers.
Takegoodnotes.
Taketimeaftereachruntowritedownnotesaboutwhatyoudidandhowyoufelt.Lookforthingsthathappenagainandagain.Forexampleyoumayfindthatyourkneeshurtwhenyourunsometimes.Butperhapsyoufeelgreatwhenyouhavearestbetweenrunningdays.Thesenoteswillhelpyoumakethebestplanforrunning.
49.Inthesecondparagraphweknow____.
A.agoodhabitofrunningmayhelpyoulivelonger
B.thenumberofnon-runnerswasgettingsmaller
C.threequartersof55000adultswerenewtorunning
D.thehopetolivethreeyearslongerdrivespeopletoexercise
50.Increasesindistanceorspeeddependon.____
A.whatthefitnessexpertssay
B.whetheryouhavethebestshoes
C.howyourbodyfeels
D.whyyoustartrunning
51.Thepurposeoftakingnotesisto.____
A.remindyouofwheretohavenewshoes
B.helpyoufindthewayofrunningthatfitsyou
C.takearestbetweenrunningdays
D.helpyoudosomeresearchonexercise
52.Th