【Here’sanewwarningfromhealthexperts:sittingisdeadly.Scientistsareincreasinglywarningthatsittingforlongperiodsevenifyouexerciseregularlycouldbebadforyourhealth.Anditdoesn'tmatterwherethesittingtakesplace-】

　　Here’sanewwarningfromhealthexperts:sittingisdeadly.Scientistsareincreasinglywarningthatsittingforlongperiodsevenifyouexerciseregularlycouldbebadforyourhealth.Anditdoesn'tmatterwherethesittingtakesplace--intheofficeatschoolinthecarorbeforeacomputerorTV.Justtheoverallnumberofhoursittakesmatters.Severalstudiessuggestpeoplewhospendmostoftheirdayssittingaremorelikelytobefathaveaheartattackorevendie.

　　Whilehealthofficialshaveissued(发布)guidelinesadvisingontheleastamountsofphysicalactivitiestheyhaven’tsuggestedpeopletrytolimithowmuchtimetheyspendinaseatedposition.

　　“Afterfourhoursofsittingthebodystartstosendharmfulsignals”saidEkblom-BakoftheSwedishSchoolofSportandHealthSciences.Sheexplainedthatgenescontrollingtheamountofglucose(葡萄糖)andfatinthebodystarttoshutdown.

　　Evenforpeoplewhoexercisespendinglongperiodsoftimesittingatadeskisstillharmful.TimArmstrongaphysicalactivityexpertattheWorldHealthOrganizationsaidpeoplewhoexerciseeverydaybutstillspendalotoftimesittingmightgetmorebenefitsifthatexercisewerespreadacrossthedayratherthaninasinglehour.

　　Stillinastudythattrackedmorethan17000Canadiansforaboutadozenyearsresearchersfoundpeoplewhosatmorehadahigherdeathriskwhethertheyexercisedornot.

　　Expertssaidmoreresearchisneededtofigureoutjusthowmuchsittingisdangerousandwhatmightbepossibletooffsetthoseeffects.

　　“Peopleshouldkeepexercisingbecausethathasalotofbenefits”Ekblom-Baksaid.“Andwhenthey’reintheofficetheyshouldtrytointerruptsittingasoftenaspossible.”

　　24.Theunderlinedword“offset"inParagraph6mostprobablymeans" ".

　　A.turnto B.workout C.getridof D.makeuseof

　　25.Sittingtoomuchisdangerousbecauseitcan .

　　A.makeapersonunabletoexerciseenoughinaday

　　B.destroythebalanceofglucoseandfatinthebody

　　C.increaseglucoseandfatinthebody

　　D.makeapersonbecomelazy

　　26.IntheopinionofEkblom-Bakwhenatworkyou’dbetterhavearestby .