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1、Unit3Traveljournal一、阅读理解。Illegallytradedendangeredspeciesthatescape,formingsecondarypopulations,offerhopetotheirlong-termsurvival,astudysuggests."ThisfirstcametomyattentionwhenIreadanewsstoryabouttheseizureofanillegalshipmentof23yellowcrestedcockatoos(小葵花凤头鹦鹉),"saidLukeGibson,a
2、collegeteacher.Helearnedthatthespecieswascriticallyendangered,whichsurprisedhim.ThisencouragedDr.Gibsonandhiscolleaguetoinvestigate(调查)howacriticallyendangeredspecieshadbeeself-sustainingoutsideofitsnaturalrange.Theydiscovered49casesofagloballythreatenedspeciesbeingestablisheda
3、saseparatepopulation,whichtheyhadn’tthoughtof,includingtheyellow-crestedcockatoointheircity."Thisisaspecieswhichisprimarilythreatenedbywildlifetrade,"hetoldBBCNews."Poachers(偷猎者)gooutintotheforestinitsnativerangeineasternIndonesiaandcapturethebirdandthenshipthemoff,usuallyuptoo
4、urcitywherethereisastrongdemandforpetbirds.Thisiswhathasfueledthedeclineofthisspeciesinitsnativerange.Butit'sreallyinterestingbecausethatsamecausealsohadanothereffect:someofthepeoplewhowerekeepingthisspecieshereaccidentallyorintentionallyreleasedthem.”Asaresultofenoughofthebird
5、ssetfree,itallowedanewself-sustainingpopulationtobeestablishedinthiscity.ThegovernmentinofDr.Gibson’scityhasmadeitillegaltocapturethespecies,eventhoughitisanon-nativespecies.Becausethecityisaffluentandrelativelywelleducated,thecasesofpeoplebreakingthelawareextremelyrare,explain
6、edDrGibson,unlikeinitsnativerangeinIndonesia,wherecapturingbirdsformsamajorsourceofine.However,therecanbedownsides(缺点)tothenewlyestablishedpopulationofendangeredspecies,suchasalimitedgeneticpool,andsufferingfromnoveldiseases.Itdidalsopresentapossible“veryinteresting”opportunity
7、forconservationists,Dr.Gibsonsuggested.Thiswouldinvolve"harvesting"someofthenewlyestablishedsecondarypopulation,whichmayprovideawaytohelpslowglobalbiodiversityloss.1.WhatwasbeyondGibson’sexpectationsaccordingtothefirstparagraph?A.Thehighrateofwildlifetrade.B.Thepreciousnessofth
8、ebirds.C.Thefactthatthebirdsnearlydisappear.D.Thenewst