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1、2019版高一英语寒假作业9实验班第一部分阅读理解（共两节，满分40分）第一节 （共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的四个选项（A、B、C、和D）中，选出最佳选项，并在答题卡上将该项涂黑。IsItBadtoCrossYourLegsWhenYouSit?Crossingyourlegsisanextremelymonhabit;mostpeopledon’tevennoticethatthey’redoingitwhentheysitdown.Whileyoumayfi
2、nditfortabletositwithonekneecrossedovertheother,itmightbecausinghealthproblemsthatyouarenotawareof.AstudypublishedinBloodPressureMonitoringstatedthatsittingwithyourlegscrossedcanincreaseyourbloodpressure.Thereasonthishappensisbecausethebloodinyourlegs
3、hastoworkagainstgravitytobepumpedbacktoyourheart,crossingonelegovertheotherincreasesresistance,makingitevenharderforthebloodtocirculate.Thiscausesyourbodytoincreaseyourbloodpressuretopushthebloodbacktotheheart.Youwon'tfeelanyimmediateeffects,butifyous
4、itforlongperiodsoftimeit'simportantthatyoutakenoteofhowlongyouhaveyourlegscrossedfor.Youshouldn'thaveyourlegscrossedformorethan15minutes,andit'simportantthatyougetupandwalkaroundatleastonceeveryhour.Crossingyourlegscanalsoleadtoneckandbackpain.Ideally
5、,it'sbestforourbodiestositwithourfeetplantedflat,hipwidthapart,onthefloor,butit'snoteasytomaintainperfectposturealldayattheoffice.Whenyousitwithyourlegscrossedyourhipsareinatwistedposition,whichcancauseoneofyourpelvicbonestorotate.Sinceyourpelvicbones
6、upportsyourneckandspine,thiscancausepressureonyourlowerandmiddlebackandneck.Youalsomightnoticethatwhenyousitwithyourlegscrossedforlongperiodsoftimeyourfeetandlegsgettinglyorhavethefeelingofbeingasleep.Thisisbecausewhenonelegsitsontopoftheotheritcauses
7、pressureontheveinsandnervesinyourlegsandfeet.Itcancausenumbnessand/ortemporaryparalysisinthelegs,ankles,orfeet.Whilethefeelingofdisfortmayonlylastaminuteortwo,repeatedlycrossingyourlegsuntiltheyfeelnumbcancausepermanentnervedamage.Sonexttimeyousitdown
8、,trytogetyourselfinthehabitofsittingwithbothofyourfeetonthefloor.Notonlywillithelpyourpostureandstability,butitwillalsosaveyourhealthinthelongrun.21.Accordingtopara2,wecaninferthat___________A.it'snobigdealtocrossourlegsforlessthan15minutes.B.
