Officeworkersshouldknowthatlongperiodsofsittingatyourdeskmaybeakiller.Scientistshaveshownanewthreatfromthislifestylethattheycall“muscularinactivity(肌肉迟钝)”．Sittingstillforlongperiodsoftimeleadstoth

　　Officeworkersshouldknowthatlongperiodsofsittingatyourdeskmaybeakiller.Scientistshaveshownanewthreatfromthislifestylethattheycall “muscularinactivity(肌肉迟钝)”．

　　Sittingstillforlongperiodsoftimeleadstothebuildupofsubstances(物质)inthebloodthatareharmfultohealth.Andexercisealonewon’tdrivethemaway.

　　Millionsofpeoplespendtheirdaysbetweencar，officedeskandthesofainfrontoftheTV.Whilethebadinfluencesarewellrocognized，ithasbeenthoughtthattheycanbechangedbyregulartripstothegymorswimmingpool.

　　Nowresearcherssaythatisnotenough.Inadditiontoregularexercise，officeworkersneedtokeepmovingwhiletheywork，bymakingregulartripstotheprinter，coffeemachineortochatwithworkmates.

　　ElinEkblom­Bak，anexpertonhealth，saysresearchshowslongperiodsofsittingandlack(缺乏) of“wholebodymuscularmovement” arestronglylinkedtoobesity，heartdiseaseandcancer，andahigherriskofdeath，regardlessof(不管)whethertheytakeenoughexercise.

　　“Everyoneknowsaboutthehealthbenefitsofregularexercise.Butwhatwehaven’trealizedbeforeisthatlong­periodsittingdowncarriesanextrariskthatcannotbedealtwithbytakingexercise，”DrEkblom­Baksaid，addingthatsittingstillshouldberecognizedasarisktohealth.

　　“Itisimportanttohaveafive­minutebreakfromdeskworkevery45minutes.Don’temailworkmates—walkacrosstheofficetogivethemthemessage.Takeacoffeebreakorputtheprinterinthenextroom.IamadeskworkerandItrytodoit.Itisnotdifficultbutsometimesyougetlostinyourworkandyouforgetaboutit.”

　　However，morestudiesareneededtoconfirmtheilleffectsofsittingfortoolongandwaysoffightingthem.Butatpresenttheyconcludethat “keepmoving” shouldbeaddedtotheadviceto“keepexercising.”Nowadays，manyofficeworkerswronglythinkthat________Whatdoestheauthorsuggestofficeworkersshoulddo?Thelastparagraphsuggeststhattheresultofthestudyis________Whatwouldbethebesttitleforthepassage?

　　A.longperiodsofsittinghasbadinfluencesonthem

　　B.regularexercisebenefitsthemafterlongperiodsofsitting

　　C.theyarelivingalifestylecalle