2019届高考英语一轮训练选模块3unit3backtothepast牛津译林版

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1、Unit3Backtothepast一、阅读理解。Crossingyourlegsisanextremelycommonhabit;mostpeopledon'tevennoticethatthey'redoingitwhentheysitdown.Whileyoumayfinditcomfortabletositwithonekneecrossedovertheother,itmightbecausinghealthproblemsthatyouarenotawareof.AstudypublishedinBl

2、oodPressureMonitoringstatedthatsittingwithyourlegscrossedcanincreaseyourbloodpressure.Thereasonforthisisthatthebloodinyourlegshastoworkagainstgravitytobepumpedbacktoyourheartandthatcrossingonelegovertheotherincreasesresistance,makingitevenharderforthebloodtoc

3、irculate.Thiscausesyourbodytoincreaseyourbloodpressuretopushthebloodbacktotheheart.Youwon'tfeelanyimmediateeffects,butrepeated,drawn-outincreasesinbloodpressurecancauselong-termhealthissues.So,planningtositforalongperiodoftime?Don'tkeepyourlegscrossed.Crossin

4、gyourlegsatthekneecanalsocausepressureonthemajornerveinyourlegthatpassesjustbelowyourkneeandalongtheoutsideofyourleg,explainsRichardGraves,amedicalexpert.Thispressurecancausenumbnessandtemporaryparalysis(麻痹)ofsomeofthemusclesinyourfootandleg,preventingyoufrom

5、beingabletoraiseyourankle—whatweknowasthat“pinsandneedles”sensation.Whilethefeelingofdiscomfortmayonlylastaminuteortwo,repeatedlycrossingyourlegsuntiltheyfeelnumbcancausepermanentnervedamage.Sonexttimeyousitdown,trytogetyourselfinthehabitofsittingwithbothofyo

6、urfeetonthefloor.Notonlywillithelpyourpostureandstability,butitwillalsosaveyourhealthinthelongrun.1.Whatcanwelearnaboutcrossingone'slegs?A.Itisaverybadsocialhabit.B.Itisusuallypracticeddeliberately.C.Itcanmakeothersfeeluncomfortable.D.Itcandoharmtopeople'shea

7、lth.2.Accordingtothestudy,sittingwithyourlegscrossedcan______.11A.resistgravityeffectivelyB.affectyourbloodpressureC.leadtoheartattackseasilyD.improvethefunctionoflegs3.Inthethirdparagraph"pinsandneedles"probablymeans______.A.seriousmuscleinjuriesB.beingalitt

8、lenervousC.slightsharppainsD.beinghighlyflexible4.Whatisthemainpurposeofthetext?A.Togivereaderssomeadvice.B.Tocomparecommonhabits.C.Toevaluateeffectsofanexperiment.D.Tointroduceresearchme