高考英语(人教)一轮预热自练题必修1U1及答案.docx

高考英语(人教)一轮预热自练题必修1U1及答案.docx

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时间:2021-03-03

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1、2019高考英语(人教)一轮预热自练题必修1U1及答案**阅读理解。Crossingyourlegsisanextremelycommonhabit;mostpeopledon'tevennoticethatthey'redoingitwhentheysitdown.Whileyoumayfinditcomfortabletositwithonekneecrossedovertheother,itmightbecausinghealthproblemsthatyouarenotawareof.AstudypublishedinBloodPres

2、sureMonitoringstatedthatsittingwithyourlegscrossedcanincreaseyourbloodpressure.Thereasonforthisisthatthebloodinyourlegshastoworkagainstgravitytobepumpedbacktoyourheartandthatcrossingonelegovertheotherincreasesresistance,makingitevenharderforthebloodtocirculate.Thiscausesyour

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

4、nthemajornerveinyourlegthatpassesjustbelowyourkneeandalongtheoutsideofyourleg,explainsRichardGraves,amedicalexpert.Thispressurecancausenumbnessandtemporaryparalysis(麻痹)ofsomeofthemusclesinyourfootandleg,preventingyoufrombeingabletoraiseyourankle—whatweknowasthatpinsand“needl

5、es”sensation.Whilethefeelingofdiscomfortmayonlylastaminuteortwo,repeatedlycrossingyourlegsuntiltheyfeelnumbcancausepermanentnervedamage.Sonexttimeyousitdown,trytogetyourselfinthehabitofsittingwithbothofyourfeetonthefloor.Notonlywillithelpyourpostureandstability,butitwillalso

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

7、yB.affectyourbloodpressureC.leadtoheartattackseasilyD.improvethefunctionoflegs3.Inthethirdparagraph"pinsandneedles"probablymeans______.第1页A.seriousmuscleinjuriesB.beingalittlenervousC.slightsharppainsD.beinghighlyflexible4.Whatisthemainpurposeofthetext?A.Togivereaderssomeadv

8、ice.B.Tocomparecommonhabits.C.Toevaluateeffectsofanexperiment.D.Tointroduce

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