minutes.【答案】14.A15.B16.A17.C【解析】M:Weallknowthatexerciseisgoodforus,butsometimesitseemstoohardtoleavethesofa.W:Icanseethat.Youseldomdoexercise.M:Plus,havingthedoctortellustogettwoandahalfhours’exerciseaweekdoesn’treallyhelpourmotivationmuch.W:Don’tbediscouraged.Nowanewstudysuggestsgettingbenefitsfromexercisedoesn’thavetobethatdemanding.JacobSattelmairfromHarvardUniversityhasdoneastudyintohowmuchexerciseisneededtolowertheriskofheartattacks.M:Mmm…,interesting!W:Thestudyshowedthatpeoplewhoputin300minutesaweekofexercisehada20%lowerriskofdeathduetoheartdisease.Still,thepeoplewhoexercise115minutesaweekdidprettywell,too,loweringtheirdeathriskby14%.M:Andwhataboutthepeoplewhoexercisehalfasmuchasthat,likewhatIprobablydo?Doesthathelp?W:Ofcourse,even15minuteswouldhelp.【14题详解】此为听力题,解析略。【15题详解】此为听力题,解析略。