2019年高考英语一轮优练题 Unit 4 Global warming（含解析）新人教版选修6

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1、Globalwarming一、阅读理解。Everyoneknowsthatdeathisnatural,butdoyouhaveanyideaoftheprocessofdying?Modernscientistsdividetheprocessofdyingintotwostages—clinicalortemporarydeathandbiologicaldeath.Clinicaldeathoccurswhenthevitalorgans,suchastheheartorlungs,havestoppedfunctioning,buthavenotsuffered

2、permanentdamage.Theorganismcanstillbesaved.Biologicaldeathoccurswhenchangesintheorganismleadtothe“breakingup”ofvitalcellsandtissues.Deathisthenunchangeableandfinal.Scientistshavebeenseekingawaytoprolongtheperiodofclinicaldeathsothattheorganismcanremainalivebeforebiologicaldeathoccurs.The

3、bestmethoddevelopedsofarinvolvescoolingtheorganism,binedwithnarcotic(麻醉)sleep.Byslowingdownthebody’smetabolism(新陈代谢),coolingdelaystheprocessesleadingtobiologicaldeath.Toshowhowthisworks,scientistsperformedanexperimentonasix-year-oldfemalemonkeycalledKeta.ThescientistputKetatosleepwithana

4、rcotic.Thentheysurroundedherbodywithice-bagsandbegancheckingherbodytemperature.Whenithaddroppedto28degreesthescientistsbegantakingbloodoutfromanartery(动脉).Themonkey’sbloodpressuredecreasedandanhourlaterboththeheartandbreathingstopped:clinicaldeathsetin.FortwentyminutesKetaremainedinthiss

5、tate.Hertemperaturedroppedto22degrees.Atthispointthescientistspumpedbloodintoanarteryinthedirectionoftheheartandstartedartificialbreathing.AftertwominutesKeta’sheartbecameactiveoncemore.Afterfifteenminutes,spontaneous(自发的)breathingbegan,andafterfourhoursKetaopenedhereyesandliftedherhead.

6、 Aftersixhours,whenthescientiststriedtogiveherapenicillin(青霉素)injection,Ketaseizedthesyringe(注射器)andranwithitaroundtheroom. Herbehaviordifferedlittlefromthatofahealthyanimal.1.Forapersonwhosuffersfromtheclinicaldeath_________.A.he is still very much aliveB.he cannot avoid final deathC.hi

7、s most important organs are damagedforeverD.hestillhasthepossibilityofgettingbacktolife2.Scientiststrytomakethetimeofclinicaldeathlongerinorderto_________.A.cool the organismB.delay the ing of biological deathC.slow down the body’s metabolismD.bringvitalcellsandtissuesbac