请阅读短文，完成此题。 Here'sawarningfromhealthexperts:Sittingisdeadly.Scientistsareincreasinglywarningthatsittingforprolongedperiods--evenifyoualsoexerciseregularly--couldbebadforyourhealth.Anditdoesn'tmatterwherethesittingtakesplaceattheoffice,atschool,inthecarorbeforeacomputerorTV--justtheoverallnumberofhoursitoccurs. Researchispreliminary,butseveralstudiessuggestpeoplewhospendmostoftheirdayssittingaremorelikelytobefat,haveaheartattackorevendie. InaneditorialpublishedthisweekintheBritishJournalofSportsMedicine,ElinEkblom-BakoftheSwedishSchoolofSportandHealthSciencessuggestedthatauthoritiesrethinkhowtheydefinephysicalactivitytohighlightthedangersofsitting. Whilehealthofficialshaveissuedguidelinesrecommending~nini~numamountsofphysicalactivity,theyhaven'tsuggestedpeopletrytolimithowmuchtimetheyspendinaseatedposition. "Afterfourhoursofsitting,thebodystartstosendharmfulsignals,"Ekblom-Baksaid.Sheexplainedthatgenesregulatingtheamountofglucoseandfatinthebodystarttoshutdown. Evenforpeoplewhoexercise,spendinglongstretchesoftimesittingatadeskisstillharmful.TimArmstrong,aphysicalactivityexpertattheWorldHealthOrganization,saidpeoplewhoexerciseeveryday--butstillspendalotoftimesitting--mightgetmorebenefitifthatexercisewerespreadacrosstheday,ratherthaninasinglebout. Thatwasn'twelcomenewsforAytekinCan,31,whoworksataLondonfinancialcompany,andspendsmostofhisdayssittinginfrontofacomputer.Severaleveningsaweek,Canalsoteachesjiujitsu,aJapanesemartialartinvolvingwrestling,andalsodoesThaiboxing. "I'msuretherearesomedetrimentaleffectsofstayingstillfortoolong,butIhopethatbeingactivewhenIcanhelps,"hesaid."Iwouldn'twanttothinkthesittingcouldbethatdangerous." Still,inastudypublishedlastyearthattrackedmorethan17,000Canadiansforaboutadozenyears,researchersfoundpeoplewhosatmorehadahigherdeathrisk,independentlyofwhetherornottheyexercised. FiguresfromaUSsurveyin2003-2004foundAmericansspendmorethanhalftheirtimesitting,fromworkingattheirdeskstosittingincars. Expertssaidmoreresearchisneededtofigureoutjusthowmuchsittingisdangerous,andwhatmightbepossibletooffsetthoseeffects. "Peopleshouldkeepexercisingbecausethathasalotofbenefits,"Ekblom-Baksaid."Butwhenthey'reintheoffice,theyshouldtrytointerruptsittingasoftenaspossible,"shesaid."Don'tjustsendyourcolleagueane-mail.Walkoverandtalktohim.Standup." Whatdoesthelastparagraphshow? 查看材料
A.To interrupt sitting as often as possible is good for people's health. B.Sitting for long time can hardly be avoided. C.Keep exercising can eliminate the harm of sitting. D.Office workers don't like to exercise.正确答案A
