2019高考英语一轮复习 unit 3 back to the past 牛津译林版必修3

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1、Unit3Backtothepast一、阅读理解Everyoneknowsthatdeathisnatural,butdoyouhaveanyideaoftheprocessofdying?Modernscientistsdividetheprocessofdyingintotwostages—clinicalortemporarydeathandbiologicaldeath.Clinicaldeathoccurswhenthevitalorgans,suchastheheartorlungs,havestoppedfunct

2、ioning,buthavenotsufferedpermanentdamage.Theorganismcanstillbesaved.Biologicaldeathoccurswhenchangesintheorganismleadtothe“breakingup”ofvitalcellsandtissues.Deathisthenunchangeableandfinal.Scientistshavebeenseekingawaytoprolongtheperiodofclinicaldeathsothattheorganis

3、mcanremainalivebeforebiologicaldeathoccurs.Thebestmethoddevelopedsofarinvolvescoolingtheorganism,combinedwithnarcotic(麻醉)sleep.Byslowingdownthebody’smetabolism(新陈代谢),coolingdelaystheprocessesleadingtobiologicaldeath.Toshowhowthisworks,scientistsperformedanexperimento

4、nasix-year-oldfemalemonkeycalledKeta.ThescientistputKetatosleepwithanarcotic.Thentheysurroundedherbodywithice-bagsandbegancheckingherbodytemperature.Whenithaddroppedto28degreesthescientistsbegantakingbloodoutfromanartery(动脉).Themonkey’sbloodpressuredecreasedandanhour

5、laterboththeheartandbreathingstopped:clinicaldeathsetin.FortwentyminutesKetaremainedinthisstate.Hertemperaturedroppedto22degrees.Atthispointthescientistspumpedbloodintoanarteryinthedirectionoftheheartandstartedartificialbreathing.AftertwominutesKeta’sheartbecameactiv

6、eoncemore.Afterfifteenminutes,spontaneous(自发的)breathingbegan,andafterfourhoursKetaopenedhereyesandliftedherhead. Aftersixhours,whenthescientiststriedtogiveherapenicillin(青霉素)injection,Ketaseizedthesyringe(注射器)andranwithitaroundtheroom. Herbehaviordifferedlittlefromth

7、atofahealthyanimal.1.Forapersonwhosuffersfromtheclinicaldeath_________.A.he is still very much aliveB.he cannot avoid final deathC.his most important organs are damagedforeverD.hestillhasthepossibilityofgettingbacktolife2.Scientiststrytomakethetimeofclinicaldeathlong

8、erinorderto_________.A.cool the organismB.delay the coming of biological deathC.slow down the body’s metabolismD.bringvitalcellsand