辽宁省高考英语二轮：阅读理解训练2及答案

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1、2016辽宁省高考英语二轮：阅读理解训练（2）及答案阅读下列四篇短文，从每小题后所给的AZBZC或D四个选项中，选出最佳选项。ArecentstudyofancientandmodernelephantshascomeupwiththeunexpectedconclusionthattheAfricanelephantisdividedintotwodistinet（不同的）species.ThediscoverywasmadebyresearchersatYorkandHarvardUniversitieswhentheywereexa

2、miningthegeneticrelationshipbetweentheancientwoollymammothandmastodontomodernelephants—theAsianelephant,Africanforestelephant,andAfricansavarrnaelephant・OncetheyobtainedDNAsequences（序列）fromtwofossils竹匕石），mammothsandmastodons,theteamcomparedthemwithDNAfrommodernelephants.T

3、heyfoundtotheiramazementthatmodernforestandsavannaelephantsareasdistinetfromeachotherasAsianelephantsandmammoths.ThescientistsuseddetailedgeneticanalysistoprovethattheAfricansavannaelephantandtheAfricanforestelephanthavebeendistinetspeciesforseveralmillionyears・Thediverge

4、neeofthetwospeciestookplacearoundthetimeofthedivergeneeofAsianelephantsandwoollymammoths・Thisresultamazedallthescientists.TherehasIongbeendebateinthescientificcommunitythatthetwomightbeseparatespecies,butthisisthemostconvincingscientificevidencesofarthattheyareindeeddiffe

5、rentspecies・Previously,manynaturalistsbelievedthatAfricansavannaelephantsandAfricanforestelephantsweretwopopulationsofthesamespecies,despitetheelephants"significantsizedifferences・Thesavannaelephanthasanaverageshoulderheightof3.5metreswhiletheforestelephanthasanaveragesho

6、ulderheightof2.5metres・Thesavannaelephantweighsbetweensixandseventons,roughlydoubletheweightoftheforestelephant・Butthefactthattheylooksodifferentdoesnotnecessarilymeantheyaredifferentspecies.HowevertheprooflayintheanalysisoftheDNA.AlfredRoca,assistantprofessorintheDepartm

7、entofAnimalSciencesattheUniversityofIllinois,said,"Wenowhavetotreattheforestandsavannaelephantsastwodifferentunitsforconservationpurposes.Since1950,allAfricanelephantshavebeenconservedasonespecies.Nowthatweknowtheforestandsavannaelephantsaretwoverydistinctiveanimals,thefo

8、restelephantshouldbecomeabiggerpriority（优先）forconservationpurposes/'1.Oneofthefossilsstudiedbyth