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1、Unit4GlobalwarmingA CaliforniaCondor’sShockingRecoveryCaliforniacondorsareNorthAmerica’slargestbirds,withwind-lengthofupto3meters.Inthe1980s,electricallinesandleadpoisoning(铅中毒)nearlydrovethemtodyingout.Now,electricshocktrainingandmedicaltreatmentarehe
2、lpingtorescuethesebigbirds.Inthelate1980s,thelastfewcondorsweretakenfromthewild,andtherearenowmorethan150flyingoverCaliforniaandnearbyArizona,UtahandBajainMexico.Electricallineshavebeenkillingthemoff.“Astheygointorestforthenight,theyjustdon’tseethepowerlin
3、es,”saysBruceRideoutofSanDiegoZoo.Theirwingscanbridgethegapbetweenlines,resultinginelectrocution(电死)iftheytouchtwolinesatonce.Soscientistshavecomeupwithashockingidea.Tallpoles,placedinlargetrainingareas,teachthebirdstostayclearofelectricallinesbygivingthem
4、apainfulbutundeadlyelectricshock.Beforethetrainingwasintroduced,66%ofset-freedcondorsdiedofelectrocution.Thishasnowdroppedto18%.Leadpoisonoushasprovedmoredifficulttodealwith.Whencondorseatdeadbodiesofotheranimalscontaininglead,theyabsorblargequantitiesofle
5、ad.Thisaffectstheirnervoussystemsandabilitytoproducebabybirds,andcanleadtokidney(肾)failuresanddeath.SocondorswithhighlevelsofleadaresenttoLosAngelesZoo,wheretheyaretreatedwithcalciumEDTA,achemicalthatremovesleadfromthebloodoverseveraldays.Thisworkisstartin
6、gtopayoff.Theannualdeathrateforadultcondorshasdroppedfrom38%in2000to5.4%in2011.Rideout’steamthinksthattheCaliforniacondors’averagesurvivaltimeinthewildisnowjustundereightyears.“Althoughthesemeasuresarenoteffectiveforever,theyarevitalfornow,”hesays.“Theyare
7、trulygoodbirdsthatarewortheveryeffortweputintorecoveringthem.”1.Californiacondorsattractresearchers’interestbecausethey______.A.areactiveatnightB.hadtobebredinthewildC.arefoundoninCaliforniaD.almostdiedoutinthe1980s2.Researchershavefoundelectricallinesare_
8、________.A.blockingcondors’journeyhomeB.bigkillersofCaliforniacondorsC.restplacesforcondorsatnightD.usedtokeepcondorsaway3.AccordingtoParagraph5,leadpoisoning_________.A.makescondorstoonervoustoflyB.haslittle
