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1、2019高考英语一轮阅读理解选练（6）AIllegallytradedendangeredspeciesthatescape,formingsecondarypopulations,offerhopetotheirlong-termsurvival,astudysuggests."ThisfirstcametomyattentionwhenIreadanewsstoryabouttheseizureofanillegalshipmentof23yellowcrestedcockatoos(小葵花凤头鹦鹉),"saidLukeGibson,acollegeteacher.Hele
2、arnedthatthespecieswascriticallyendangered,whichsurprisedhim.ThisencouragedDr.Gibsonandhiscolleaguetoinvestigate(调查)howacriticallyendangeredspecieshadbeeself-sustainingoutsideofitsnaturalrange.Theydiscovered49casesofagloballythreatenedspeciesbeingestablishedasaseparatepopulation,whichtheyhad
3、n’tthoughtof,includingtheyellow-crestedcockatoointheircity."Thisisaspecieswhichisprimarilythreatenedbywildlifetrade,"hetoldBBCNews."Poachers(偷猎者)gooutintotheforestinitsnativerangeineasternIndonesiaandcapturethebirdandthenshipthemoff,usuallyuptoourcitywherethereisastrongdemandforpetbirds.This
4、iswhathasfueledthedeclineofthisspeciesinitsnativerange.Butit'sreallyinterestingbecausethatsamecausealsohadanothereffect:someofthepeoplewhowerekeepingthisspecieshereaccidentallyorintentionallyreleasedthem.”Asaresultofenoughofthebirdssetfree,itallowedanewself-sustainingpopulationtobeestablishe
5、dinthiscity.ThegovernmentinofDr.Gibson’scityhasmadeitillegaltocapturethespecies,eventhoughitisanon-nativespecies.Becausethecityisaffluentandrelativelywelleducated,thecasesofpeoplebreakingthelawareextremelyrare,explainedDrGibson,unlikeinitsnativerangeinIndonesia,wherecapturingbirdsformsamajor
6、sourceofine.However,therecanbedownsides(缺点)tothenewlyestablishedpopulationofendangeredspecies,suchasalimitedgeneticpool,andsufferingfromnoveldiseases.Itdidalsopresentapossible“veryinteresting”opportunityforconservationists,Dr.Gibsonsuggested.Thiswouldinvolve"harvesting"someofthenewlyestablis
7、hedsecondarypopulation,whichmayprovideawaytohelpslowglobalbiodiversityloss.1.WhatwasbeyondGibson’sexpectationsaccordingtothefirstparagraph?A.Thehighrateofwildlifetrade.B.Thepreciousnessofthebirds.C.Thefactthatthebirdsnearlydisappear.D.Thenewsthatth
