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1、2019高考英语一轮阅读理解选练（6）李仕才AIllegallytradedendangeredspeciesthatescape,formingsecondarypopulations,offerhopetotheirlong-termsurvival,astudysuggests."ThisfirstcametomyattentionwhenIreadanewsstoryabouttheseizureofanillegalshipmentof23yellowcrestedcockatoos(小葵花凤头鹦鹉),"saidLukeG
2、ibson,acollegeteacher.Helearnedthatthespecieswascriticallyendangered,whichsurprisedhim.ThisencouragedDr.Gibsonandhiscolleaguetoinvestigate(调查)howacriticallyendangeredspecieshadbecomeself-sustainingoutsideofitsnaturalrange.Theydiscovered49casesofagloballythreatenedspeci
3、esbecomingestablishedasaseparatepopulation,whichtheyhadn’tthoughtof,includingtheyellow-crestedcockatoointheircity."Thisisaspecieswhichisprimarilythreatenedbywildlifetrade,"hetoldBBCNews."Poachers(偷猎者)gooutintotheforestinitsnativerangeineasternIndonesiaandcapturethebird
4、andthenshipthemoff,usuallyuptoourcitywherethereisastrongdemandforpetbirds.Thisiswhathasfueledthedeclineofthisspeciesinitsnativerange.Butit'sreallyinterestingbecausethatsamecausealsohadanothereffect:someofthepeoplewhowerekeepingthisspecieshereaccidentallyorintentionally
5、releasedthem.”Asaresultofenoughofthebirdssetfree,itallowedanewself-sustainingpopulationtobeestablishedinthiscity.ThegovernmentinofDr.Gibson’scityhasmadeitillegaltocapturethespecies,eventhoughitisanon-nativespecies.Becausethecityisaffluentandrelativelywelleducated,theca
6、sesofpeoplebreakingthelawareextremelyrare,explainedDrGibson,unlikeinitsnativerangeinIndonesia,wherecapturingbirdsformsamajorsourceofincome.However,therecanbedownsides(缺点)tothenewlyestablishedpopulationofendangeredspecies,suchasalimitedgeneticpool,andsufferingfromnoveld
7、iseases.Itdidalsopresentapossible“veryinteresting”opportunityforconservationists,Dr.Gibsonsuggested.Thiswouldinvolve"harvesting"someofthe12newlyestablishedsecondarypopulation,whichmayprovideawaytohelpslowglobalbiodiversityloss.1.WhatwasbeyondGibson’sexpectationsaccordi
8、ngtothefirstparagraph?A.Thehighrateofwildlifetrade.B.Thepreciousnessofthebirds.C.Thefactthatthebirdsnearlydisappear.D
