2019届高考英语一轮训练选模块3Unit3Backtothepast牛津译林版.docx

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

2、toringstatedthatsittingwithyourlegscrossedcanincreaseyourbloodpressure.Thereasonforthisisthatthebloodinyourlegshastoworkagainstgravitytobepumpedbacktoyourheartandthatcrossingonelegovertheotherincreasesresistance,makingitevenharderforthebloodtocirculate.Thiscausesyourbodytoi

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

4、jornerveinyourlegthatpassesjustbelowyourkneeandalongtheoutsideofyourleg,explainsRichardGraves,amedicalexpert.Thispressurecancausenumbnessandtemporaryparalysis(麻痹)ofsomeofthemusclesinyourfootandleg,preventingyoufrombeingabletoraiseyourankle—whatweknowasthat“pinsandneedles”se

5、nsation.Whilethefeelingofdiscomfortmayonlylastaminuteortwo,repeatedlycrossingyourlegsuntiltheyfeelnumbcancausepermanentnervedamage.Sonexttimeyousitdown,trytogetyourselfinthehabitofsittingwithbothofyourfeetonthefloor.Notonlywillithelpyourpostureandstability,butitwillalsosave

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

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

8、.Tocomparecommonhabits.C.Toevaluateeffectsofanexperiment.D.Tointroduceresearchmeth