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1、Unit4GlobalwarmingA CaliforniaCondor’sShockingRecoveryCaliforniacondorsareNorthAmerica’slargestbirds,withwind-lengthofupto3meters.Inthe1980s,electricallinesandleadpoisoning(铅中毒)nearlydrovethemtodyingout.Now,electricshocktrainingandmedicaltreatmentarehelpingtorescuethesebigbirds.In
2、thelate1980s,thelastfewcondorsweretakenfromthewild,andtherearenowmorethan150flyingoverCaliforniaandnearbyArizona,UtahandBajainMexico.Electricallineshavebeenkillingthemoff.“Astheygointorestforthenight,theyjustdon’tseethepowerlines,”saysBruceRideoutofSanDiegoZoo.Theirwingscanbridgethega
3、pbetweenlines,resultinginelectrocution(电死)iftheytouchtwolinesatonce.Soscientistshavecomeupwithashockingidea.Tallpoles,placedinlargetrainingareas,teachthebirdstostayclearofelectricallinesbygivingthemapainfulbutundeadlyelectricshock.Beforethetrainingwasintroduced,66%ofset-freedcondorsdi
4、edofelectrocution.Thishasnowdroppedto18%.Leadpoisonoushasprovedmoredifficulttodealwith.Whencondorseatdeadbodiesofotheranimalscontaininglead,theyabsorblargequantitiesoflead.Thisaffectstheirnervoussystemsandabilitytoproducebabybirds,andcanleadtokidney(肾)failuresanddeath.Socondorswithhig
5、hlevelsofleadaresenttoLosAngelesZoo,wheretheyaretreatedwithcalciumEDTA,achemicalthatremovesleadfromthebloodoverseveraldays.Thisworkisstartingtopayoff.Theannualdeathrateforadultcondorshasdroppedfrom38%in2000to5.4%in2011.Rideout’steamthinksthattheCaliforniacondors’averagesurvivaltimeint
6、hewildisnowjustundereightyears.“Althoughthesemeasuresarenoteffectiveforever,theyarevitalfornow,”hesays.“Theyaretrulygoodbirdsthatarewortheveryeffortweputintorecoveringthem.”1.Californiacondorsattractresearchers’interestbecausethey______.11A.areactiveatnightB.hadtobebredinthewildC.aref
7、oundoninCaliforniaD.almostdiedoutinthe1980s2.Researchershavefoundelectricallinesare_________.A.blockingcondors’journeyhomeB.bigkillersofCaliforniacondorsC.restplacesforcondorsatnightD.usedtokeepcondorsaway3.AccordingtoParagraph5,leadpoisoning_________.A.makescondorstoonervoustoflyB.ha
8、slitt
