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1、Unit4Bodylanguage**阅读理解Illegallytradedendangeredspeciesthatescape,formingsecondarypopulations,offerhopetotheirlong-termsurvival,astudysuggests."ThisfirstcametomyattentionwhenIreadanewsstoryabouttheseizureofanillegalshipmentof23yellowcrestedcockatoos(小葵花凤头鹦鹉),"saidLukeGibson,acollegeteacher.He
2、learnedthatthespecieswascriticallyendangered,whichsurprisedhim.ThisencouragedDr.Gibsonandhiscolleaguetoinvestigate(调查)howacriticallyendangeredspecieshadbecomeself-sustainingoutsideofitsnaturalrange.Theydiscovered49casesofagloballythreatenedspeciesbecomingestablishedasaseparatepopulation,which
3、theyhadn’tthoughtof,includingtheyellow-crestedcockatoointheircity."Thisisaspecieswhichisprimarilythreatenedbywildlifetrade,"hetoldBBCNews."Poachers(偷猎者)gooutintotheforestinitsnativerangeineasternIndonesiaandcapturethebirdandthenshipthemoff,usuallyuptoourcitywherethereisastrongdemandforpetbird
4、s.Thisiswhathasfueledthedeclineofthisspeciesinitsnativerange.Butit'sreallyinterestingbecausethatsamecausealsohadanothereffect:someofthepeoplewhowerekeepingthisspecieshereaccidentallyorintentionallyreleasedthem.”Asaresultofenoughofthebirdssetfree,itallowedanewself-sustainingpopulationtobeestab
5、lishedinthiscity.ThegovernmentinofDr.Gibson’scityhasmadeitillegaltocapturethespecies,eventhoughitisanon-nativespecies.Becausethecityisaffluentandrelativelywelleducated,thecasesofpeoplebreakingthelawareextremelyrare,explainedDrGibson,unlikeinitsnativerangeinIndonesia,wherecapturingbirdsformsam
6、ajorsourceofincome.However,therecanbedownsides(缺点)tothenewlyestablishedpopulationofendangeredspecies,suchasalimitedgeneticpool,andsufferingfromnoveldiseases.Itdidalsopresentapossible“veryinteresting”opportunityforconservationists,Dr.Gibsonsuggested.Thiswouldinvolve"harvesting"someofthenewlyes
7、tablishedsecondarypopulation,whichmayprovideawaytohelpslowglobalbiodiversityloss.1.WhatwasbeyondGibson’sexpectationsaccordingtothefirstparagraph?A.Thehighrateofwildlifetrade.B.Thepreciousnessofthebirds.C.Thefactthatthebirdsnearlydisappear.D.T
