2019高考英语一轮优编选题 Unit 4 Body language（含解析）新人教版必修4

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1、Unit4Bodylanguage一、阅读理解。Crossingyourlegsisanextremelymonhabit;mostpeopledon'tevennoticethatthey'redoingitwhentheysitdown.Whileyoumayfinditfortabletositwithonekneecrossedovertheother,itmightbecausinghealthproblemsthatyouarenotawareof.AstudypublishedinBloodPressureMonitoringstatedthatsittingwithyou

2、rlegscrossedcanincreaseyourbloodpressure.Thereasonforthisisthatthebloodinyourlegshastoworkagainstgravitytobepumpedbacktoyourheartandthatcrossingonelegovertheotherincreasesresistance,makingitevenharderforthebloodtocirculate.Thiscausesyourbodytoincreaseyourbloodpressuretopushthebloodbacktotheheart.

3、Youwon'tfeelanyimmediateeffects,butrepeated,drawn-outincreasesinbloodpressurecancauselong-termhealthissues.So,planningtositforalongperiodoftime?Don'tkeepyourlegscrossed.Crossingyourlegsatthekneecanalsocausepressureonthemajornerveinyourlegthatpassesjustbelowyourkneeandalongtheoutsideofyourleg,expl

4、ainsRichardGraves,amedicalexpert.Thispressurecancausenumbnessandtemporaryparalysis(麻痹)ofsomeofthemusclesinyourfootandleg,preventingyoufrombeingabletoraiseyourankle—whatweknowasthat“pinsandneedles”sensation.Whilethefeelingofdisfortmayonlylastaminuteortwo,repeatedlycrossingyourlegsuntiltheyfeelnumb

5、cancausepermanentnervedamage.Sonexttimeyousitdown,trytogetyourselfinthehabitofsittingwithbothofyourfeetonthefloor.Notonlywillithelpyourpostureandstability,butitwillalsosaveyourhealthinthelongrun.1.Whatcanwelearnaboutcrossingone'slegs?A.Itisaverybadsocialhabit.B.Itisusuallypracticeddeliberately.C.

6、Itcanmakeothersfeelunfortable.D.Itcandoharmtopeople'shealth.2.Accordingtothestudy,sittingwithyourlegscrossedcan______.A.resistgravityeffectivelyB.affectyourbloodpressureC.leadtoheartattackseasilyD.improvethefunctionoflegs3.Inthethirdparagraph"pinsandneedles"probablymeans______.A.seriousmuscleinju

7、riesB.beingalittlenervousC.slightsharppainsD.beinghighlyflexible4.Whatisthemainpurposeofthetext?A.Togivereaderssomeadvice.B.Toparemonhabits.C.Toevaluateeffectsofanexperiment.D.Tointroduceresearchmethods.【文章大意】本文是一篇说明文，