2019年高考英语一轮优练题unit4globalwarming（含解析）新人教版选修

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1、Globalwarming李仕才一、阅读理解。Everyoneknowsthatdeathisnatural,butdoyouhaveanyideaoftheprocessofdying?Modernscientistsdividetheprocessofdyingintotwostages—clinicalortemporarydeathandbiologicaldeath.Clinicaldeathoccurswhenthevitalorgans,suchastheheartorlungs,havestoppedfunctioning,buthavenotsufferedpe

2、rmanentdamage.Theorganismcanstillbesaved.Biologicaldeathoccurswhenchangesintheorganismleadtothe“breakingup”ofvitalcellsandtissues.Deathisthenunchangeableandfinal.Scientistshavebeenseekingawaytoprolongtheperiodofclinicaldeathsothattheorganismcanremainalivebeforebiologicaldeathoccurs.Thebestmet

3、hoddevelopedsofarinvolvescoolingtheorganism,combinedwithnarcotic(麻醉)sleep.Byslowingdownthebody’smetabolism(新陈代谢),coolingdelaystheprocessesleadingtobiologicaldeath.Toshowhowthisworks,scientistsperformedanexperimentonasix-year-oldfemalemonkeycalledKeta.ThescientistputKetatosleepwithanarcotic.Th

4、entheysurroundedherbodywithice-bagsandbegancheckingherbodytemperature.Whenithaddroppedto28degreesthescientistsbegantakingbloodoutfromanartery(动脉).Themonkey’sbloodpressuredecreasedandanhourlaterboththeheartandbreathingstopped:clinicaldeathsetin.FortwentyminutesKetaremainedinthisstate.Hertemper

5、aturedroppedto22degrees.Atthispointthescientistspumpedbloodintoanarteryinthedirectionoftheheartandstartedartificialbreathing.AftertwominutesKeta’sheartbecameactiveoncemore.Afterfifteenminutes,spontaneous(自发的)breathingbegan,andafterfourhoursKetaopenedhereyesandliftedherhead. Aftersixhours,when

6、thescientiststriedtogiveherapenicillin(青霉素)injection,Ketaseizedthesyringe(注射器)andranwithitaroundtheroom. Herbehaviordifferedlittlefromthatofahealthyanimal.1.Forapersonwhosuffersfromtheclinicaldeath_________.A.he is still very much aliveB.he cannot avoid final deathC.his most important organs 

7、are damagedforeverD.hestillhasthepossibilityofgettingbacktolife2.Scientiststrytomakethetimeofclinicaldeathlongerinorderto_________.A.cool the organismB.delay the coming of biological deathC.slow down the body’s metabolismD.bringvitalcellsandt