第三部分：阅读理解（共20小题，每题2分，满分40分）
Sittingtoomuchisnowlistedwithsmokingandjunkfoodasabadhabitthatincreasesyourriskofheartdisease.
NewAustralianresearchshowsthathalf-an-hourinthegymwillnotmakeupforthewaist-expandingdamagecausedbyspendingtherestofthedaysitting.
Butthegoodnewsisthatdoingchores(家务杂事)inthehouseorgentlywalkingaroundtheofficewhileonthephonemightbeenoughtokeepyoufit.
Thestudyjoinsthegrowingbodyofevidencesuggestingtoomuchsittingmightundothebenefitsofexercise.
Thestudymeasuredtheintensity(强度)ofphysicalactivitiesin168subjectsoversevendays.Itfoundthatregardlessofhowmuchexercisetheydidortheirtotalsittingtimethosewhotookmorebreaksfromsittinghadlowerriskofthickwaistsandlowerlevelsofbloodlipids(脂质).
“Higherlevelsofbloodlipidshavebeenlinkedtoaheightenedriskofheartdisease”principalresearcherGenevieveHealyoftheUniversityofQueenslandsaid.“Whatthestudyshowsisthattherearebenefitsinjustgettingupregularlyandinterruptingyoursittingtime.”
ResearchersbehindtheStandUpAustraliaprojecthavewrittentotheRuddGovernmentrequesting$3.5millionforatwo-yearstudyintohowlongsittingaffectshealthandproductivityofworkers.Thestudywouldalsodevelopandteststrategiesforreducingsittingtimeonthejob.
Thelateststudybuildsonworkthatisshiftingthehealthpromotionfocusfrompurposefulexercisesuchasrunningtolowerintensityactivitiesthroughouttheday.
TheAustralianresearchhasbeenbackedupbyUSstudies.
“Toholdabodythatweighs77kilogramsuprighttakesafairamountofenergyfrommuscles”saidProfessorMarcHamiltonfromtheUniversityofMissouri.“Thereisalargeamountofenergyassociatedwithstandingeverydaythatcannotbeeasilyreplacedby30to60minutesinthegym.”
56.Thestudyshowsthat .
A.exercisingfor30minutesinthegymisgoodaftersittingtoolong
B.walkingisthebestphysicalactivityaftersittingtoolong
C.sittingtoolongintheofficecausesthewaisttoexpand
D.havingbreaksfromsittingisgoodforyourhealth