阅读理解.Americaisacountryonthemove.Inunheardofnumber,peopleofallagesareexercisingtheirwaytobetterhealth.Accordingtothelatestfigures,59percentofAmericanadultsexerciseregularly-up12percentfromjusttwoyea

　　阅读理解. Americaisacountryonthemove.Inunheardofnumber,peopleofallagesareexercisingtheirwayto

　　betterhealth.Accordingtothelatestfigures,59percentofAmericanadultsexerciseregularly-up12percent

　　fromjusttwoyearsagoandmorethandoublethefigureof25yearsago.Evennon-exercisersbelievethey

　　wouldbemoreattractiveandconfidentiftheyweremoreattractive.

　　Itishardnottogetthemessage.Theadvantageofphysicalfitnessareshownonmagazinecovers,postage

　　stamps,andtelevisionadsforeverythingfrombeautysoapstotravelbooks.Exerciseasapartofdailylifedid

　　notcatchonuntilthe1960swhenresearchbymilitarydoctorsbegantoshowthehealthbenefitsofdoing

　　regularphysicalexercises.GrowingpublicityforracesheldinAmericancitieshelpedincreaseastronginterest

　　intheancientsportofrunning.AlthoughrunninghasleveledoffinrecentyearsasAmericanshavediscovered

　　equallyrewarding-andsomethingsafer-formsofexercise,suchaswalkingandswimming,runningremainsthe

　　mostpopularformofexercise.

　　Asthepopularityofexercisecontinuestoincrease,sodoesscientificevidenceofitshealthbenefits.The

　　keytofitnessisexercisingthemajormusclegroupstronglyenoughtodoubletheheartrateandkeepitdoubled

　　for20to30minutesatatime.Doingsuchphysicalexercisesthreetimesormoreaweekwillproduce

　　considerableimprovementsinphysicalhealthinaboutthreemonths.1.Accordingtothepassage,whatwasthepercentageofAmericanadultsdoingregularphysicalexercises

　　twoyearsago?[ ]A.About70%

　　B.Nearly60%

　　C.Morethan12%

　　D.Almost50%2.Sportsindailylifebegantobecomepopularas_____.[ ]A.peoplegotthemessagefrommagazinecoversandpostagestamps

　　B.ScientificevidenceofhealthbenefitswasshownonTVads

　　C.researchshowedtheirhealthbenefits

　　D.anincreasingnumberofraceswereheldinAmericanc