河北省安平县安平中学高一英语寒假作业9（实验班）.docx

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1、河北安平中学实验部高一年级英语学科寒假作业2019年2月10日第一部分阅读理解（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。AIsItBadtoCrossYourLegsWhenYouSit?Crossingyourlegsisanextremelycommonhabit;mostpeopledon’tevennoticethatthey’redoingitwhentheysitdown.Whileyoumayfinditcomfortabletositwi

2、thonekneecrossedovertheother,itmightbecausinghealthproblemsthatyouarenotawareof.AstudypublishedinBloodPressureMonitoringstatedthatsittingwithyourlegscrossedcanincreaseyourbloodpressure.Thereasonthishappensisbecausethebloodinyourlegshastoworkagainstgravitytobepumpedbacktoyourheart,crossingon

3、elegovertheotherincreasesresistance,makingitevenharderforthebloodtocirculate.Thiscausesyourbodytoincreaseyourbloodpressuretopushthebloodbacktotheheart.Youwon'tfeelanyimmediateeffects,butifyousitforlongperiodsoftimeit'simportantthatyoutakenoteofhowlongyouhaveyourlegscrossedfor.Youshouldn'tha

4、veyourlegscrossedformorethan15minutes,andit'simportantthatyougetupandwalkaroundatleastonceeveryhour.Crossingyourlegscanalsoleadtoneckandbackpain.Ideally,it'sbestforourbodiestositwithourfeetplantedflat,hipwidthapart,onthefloor,butit'snoteasytomaintainperfectposturealldayattheoffice.Whenyousi

5、twithyourlegscrossedyourhipsareinatwistedposition,whichcancauseoneofyourpelvicbonestorotate.Sinceyourpelvicbonesupportsyourneckandspine,thiscancausepressureonyourlowerandmiddlebackandneck.Youalsomightnoticethatwhenyousitwithyourlegscrossedforlongperiodsoftimeyourfeetandlegsgettinglyorhaveth

6、efeelingofbeingasleep.Thisisbecausewhenonelegsitsontopoftheotheritcausespressureontheveinsandnervesinyourlegsandfeet.Itcancausenumbnessand/ortemporaryparalysisinthelegs,ankles,orfeet.Whilethefeelingofdiscomfortmayonlylastaminuteortwo,repeatedlycrossingyourlegsuntiltheyfeelnumbcancauseperman

7、entnervedamage.Sonexttimeyousitdown,trytogetyourselfinthehabitofsittingwithbothofyourfeetonthefloor.Notonlywillithelpyourpostureandstability,butitwillalsosaveyourhealthinthelongrun.21.Accordingtopara2,wecaninferthat___________A.it'snobigdealtocrossourleg