2019高考英语一轮优编选题unit4bodylanguage含解析新人教版必修4

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1、Unit4Bodylanguage李仕才一、阅读理解。Crossingyourlegsisanextremelycommonhabit;mostpeopledon'tevennoticethatthey'redoingitwhentheysitdown.Whileyoumayfinditcomfortabletositwithonekneecrossedovertheother,itmightbecausinghealthproblemsthatyouarenotawareof.AstudypublishedinBloodPressure

2、Monitoringstatedthatsittingwithyourlegscrossedcanincreaseyourbloodpressure.Thereasonforthisisthatthebloodinyourlegshastoworkagainstgravitytobepumpedbacktoyourheartandthatcrossingonelegovertheotherincreasesresistance,makingitevenharderforthebloodtocirculate.Thiscausesyourb

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

4、eonthemajornerveinyourlegthatpassesjustbelowyourkneeandalongtheoutsideofyourleg,explainsRichardGraves,amedicalexpert.Thispressurecancausenumbnessandtemporaryparalysis(麻痹)ofsomeofthemusclesinyourfootandleg,preventingyoufrombeingabletoraiseyourankle—whatweknowasthat“pinsand

5、needles”sensation.Whilethefeelingofdiscomfortmayonlylastaminuteortwo,repeatedlycrossingyourlegsuntiltheyfeelnumbcancausepermanentnervedamage.Sonexttimeyousitdown,trytogetyourselfinthehabitofsittingwithbothofyourfeetonthefloor.Notonlywillithelpyourpostureandstability,butit

6、willalsosaveyourhealthinthelongrun.1.Whatcanwelearnaboutcrossingone'slegs?A.Itisaverybadsocialhabit.B.Itisusuallypracticeddeliberately.C.Itcanmakeothersfeeluncomfortable.D.Itcandoharmtopeople'shealth.2.Accordingtothestudy,sittingwithyourlegscrossedcan______.A.resistgravit

7、yeffectivelyB.affectyourbloodpressureC.leadtoheartattackseasilyD.improvethefunctionoflegs3.Inthethirdparagraph"pinsandneedles"probablymeans______.A.seriousmuscleinjuriesB.beingalittlenervousC.slightsharppainsD.beinghighlyflexible4.Whatisthemainpurposeofthetext?A.Togiverea

8、derssomeadvice.B.Tocomparecommonhabits.C.Toevaluateeffectsofanexperiment.D.Tointroduceresearchme