专题：阅读理解一、阅读单选Everyoneknowsthatexerciseisimportant.Weallneedtoexercise.Doctorssayitisgoodforus.Itmakesyourheartandbodystrong.Childrenwhooftenexercisearemorealert(机灵的).Thismeanstheydobetterintestsandschoolworkthanthosewhodon’texercise.Therearemanywaystoexercise.Youcanwalk,run,swim,skateorplayballgames.Makesureyouexerciseinthefollowingways:youhavetolikewhatyouaredoing,exerciseenoughbutnottoomuch.It’sbesttoexercisetwiceeachweek.Thirtyminuteseachtimeisenough.Tryallkindsofthingsuntilyoufindone,twooreventhreesportsthatarerightforyou.Youcanexerciseatfitnesscenters.Theyhavealotofequipment(设备)there.Theequipmentwillhelpexerciseyourarms,legs,andot...
