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1、Unit4WildlifeProtection阅读理解ACaliforniaCondor’sShockingRecoveryCaliforniacondors（鹰）areNorthAmerica’slargestbirds,withwind-lengthofupto3meters.Inthe1980s,electricallinesandleadpoisoning(铅中毒)nearlydrovethemtodyingout.Now,electricshocktrainingandmedicaltreatmentarehelpingtorescueth
2、esebigbirds.Inthelate1980s,thelastfewcondorsweretakenfromthewildtobebred(繁殖).Since1992,therehavebeenmultiplereintroductionstothewild,andtherearenowmorethan150flyingoverCaliforniaandnearbyArizona,UtahandBajainMexico.Electricallineshavebeenkillingthemoff.“Astheygointorestfortheni
3、ght,theyjustdon’tseethepowerlines,”saysBruceRideoutofSanDiegoZoo.Theirwingscanbridgethegapbetweenlines,resultinginelectrocution(电死)iftheytouchtwolinesatonce.Soscientistshavecomeupwithashockingidea.Tallpoles,placedinlargetrainingareas,teachthebirdstostayclearofelectricallinesbyg
4、ivingthemapainfulbutundeadlyelectricshock.Beforethetrainingwasintroduced,66%ofset-freedcondorsdiedofelectrocution.Thishasnowdroppedto18%.Leadpoisonoushasprovedmoredifficulttodealwith.Whencondorseatdeadbodiesofotheranimalscontaininglead,theyabsorblargequantitiesoflead.Thisaffect
5、stheirnervoussystemsandabilitytoproducebabybirds,andcanleadtokidney(肾)failuresanddeath.SocondorswithhighlevelsofleadaresenttoLosAngelesZoo,wheretheyaretreatedwithcalciumEDTA,achemicalthatremovesleadfromthebloodoverseveraldays.Thisworkisstartingtopayoff.Theannualdeathrateforadul
6、tcondorshasdroppedfrom38%in2000to5.4%in2011. Rideout’steamthinksthattheCaliforniacondors’averagesurvivaltimeinthewildisnowjustundereightyears.“Althoughthesemeasuresarenoteffectiveforever,theyarevitalfornow,”hesays.“Theyaretrulygoodbirdsthatarewortheveryeffortweputintorecovering
7、them.”1.Californiacondorsattractresearchers’interestbecausethey .A.areactiveatnightB.hadtobebredinthewildC.arefoundoninCaliforniaD.almostdiedoutinthe1980s2.Researchershavefoundelectricallinesare .A.blockingcondors’journeyhome B.bigkillersofCaliforbniacondorsC.restplacesforcond
8、orsatnightD.usedtokeepcondorsaway3.AccordingtoParaghap
