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1、河北省武邑中学2018-2019学年高一英语上学期寒假作业23第二部分阅读理解阅读下列短文，从每小题所给的A、B、C、D四个选项中，选出最佳选项，并在答题纸上将其涂黑。AIsItBadtoCrossYourLegsWhenYouSit?Crossingyourlegsisanextremelycommonhabit;mostpeopledon’tevennoticethatthey’redoingitwhentheysitdown.Whileyoumayfinditcomfortabletositwithonekneecrosse
2、dovertheother,itmightbecausinghealthproblemsthatyouarenotawareof.AstudypublishedinBloodPressureMonitoringstatedthatsittingwithyourlegscrossedcanincreaseyourbloodpressure.Thereasonthishappensisbecausethebloodinyourlegshastoworkagainstgravitytobepumpedbacktoyourheart,cr
3、ossingonelegovertheotherincreasesresistance,makingitevenharderforthebloodtocirculate.Thiscausesyourbodytoincreaseyourbloodpressuretopushthebloodbacktotheheart.Youwon’tfeelanyimmediateeffects,butifyousitforlongperiodsoftimeit’simportantthatyoutakenoteofhowlongyouhaveyo
4、urlegscrossedfor.Youshouldn’thaveyourlegscrossedformorethan15minutes,andit’simportantthatyougetupandwalkaroundatleastonceeveryhour.Crossingyourlegscanalsoleadtoneckandbackpain.Ideally,it’sbestforourbodiestositwithourfeetplantedflat,hipwidthapart,onthefloor,butit’snote
5、asytomaintainperfectposturealldayattheoffice.Whenyousitwithyourlegscrossedyourhipsareinatwistedposition,whichcancauseoneofyourpelvicbonestorotate.Sinceyourpelvicbonesupportsyourneckandspine,thiscancausepressureonyourlowerandmiddlebackandneck.Youalsomightnoticethatwhen
6、yousitwithyourlegscrossedforlongperiodsoftimeyourfeetandlegsgettinglyorhavethefeelingofbeingasleep.Thisisbecausewhenonelegsitsontopoftheotheritcausespressureontheveinsandnervesinyourlegsandfeet.Itcancausenumbnessand/ortemporaryparalysisinthelegs,ankles,orfeet.Whilethe
7、feelingofdiscomfortmayonlylastaminute-9-ortwo,repeatedlycrossingyourlegsuntiltheyfeelnumbcancausepermanentnervedamage.Sonexttimeyousitdown,trytogetyourselfinthehabitofsittingwithbothofyourfeetonthefloor.Notonlywillithelpyourpostureandstability,butitwillalsosaveyourhea
8、lthinthelongrun.1.Accordingtopara2,wecaninferthat___________A.it’snobigdealtocrossourlegsforlessthan15minutes.B.wewillfeelun
