北京市延庆县高考英语暑假阅读理解选练(7) 试题VIP免费

北京市延庆县2016高考英语暑假阅读理解选练（7）阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。ArecentstudyofancientandmodernelephantshascomeupwiththeunexpectedconclusionthattheAfricanelephantisdividedintotwodistinct(不同的)species.ThediscoverywasmadebyresearchersatYorkandHarvardUniversitieswhentheywereexaminingthegeneticrelationshipbetweentheancientwoollymammothandmastodontomodernelephants—theAsianelephant,Africanforestelephant,andAfricansavannaelephant.OncetheyobtainedDNAsequences(序列)fromtwofossils(化石),mammothsandmastodons,theteamcomparedthemwithDNAfrommodernelephants.TheyfoundtotheiramazementthatmodernforestandsavannaelephantsareasdistinctfromeachotherasAsianelephantsandmammoths.ThescientistsuseddetailedgeneticanalysistoprovethattheAfricansavannaelephantandtheAfricanforestelephanthavebeendistinctspeciesforseveralmillionyears.ThedivergenceofthetwospeciestookplacearoundthetimeofthedivergenceofAsianelephantsandwoollymammoths.Thisresultamazedallthescientists.Therehaslongbeendebateinthescientificcommunitythatthetwomightbeseparatespecies,butthisisthemostconvincingscientificevidencesofarthattheyareindeeddifferentspecies.Previously,manynaturalistsbelievedthatAfricansavannaelephantsandAfricanforestelephantsweretwopopulationsofthesamespecies,despitetheelephants’significantsizedifferences.Thesavannaelephanthasanaverageshoulderheightof3.5metreswhiletheforestelephanthasanaverageshoulderheightof2.5metres.Thesavannaelephantweighsbetweensixandseventons,roughlydoubletheweightoftheforestelephant.Butthefactthattheylooksodifferentdoesnotnecessarilymeantheyaredifferentspecies.HowevertheprooflayintheanalysisoftheDNA.AlfredRoca,assistantprofessorintheDepartmentofAnimalSciencesattheUniversityofIllinois,said,“Wenowhavetotreattheforestandsavannaelephantsastwodifferentunitsforconservationpurposes.Since1950,allAfricanelephantshavebeenconservedasonespecies.Nowthatweknowtheforestandsavannaelephantsaretwoverydistinctiveanimals,theforestelephantshouldbecomeabiggerpriority(优先)forconservationpurposes.”1.Oneofthefossilsstudiedbytheresearchersisthatof.A.theAsianelephantB.theforestelephantC.thesavannaelephantD.themastodonelephant2.Theunderlinedword“divergence”inParagraph4means“."AA.evolutionB.exhibitionC.separationD.examination3.Theresearchers’conclusionwasbasedonastudyoftheAfricanelephant’s.A.DNAB.heightC.weightD.population4.WhatareAlfredRoca’swordsmainlyabout?A.TheconservationofAfricanelephants.B.ThepurposeofstudyingAfricanelephants.C.ThewaytodivideAfricanelephantsintotwounits.D.ThereasonforthedistinctionofAfricanelephants.5.Whichofthefollowingcanbethebesttitleforthepassage?A.Naturalists’BeliefsaboutElephantsB.AmazingExperimentsaboutElephantsC.AnUnexpectedFindingaboutElephantsD.ALongScientificDebateaboutElephants参考答案1-5DCAAC【2013界广东省深圳市一模】AtrailwaystationsallacrossBritainnextweek,groupsofstudentswillgatherwiththeirbackpackstowaitforthetrainsthatwillcarrythemhomeforChristmas.Thisisaslargeamovementofhumanbeingsasbefore,butwithmorecontradictorytrafficflows,sothattrainsfilledwiththeyoungpasseachothertravellingineverydirection.Atfirst,Iwenthomeeveryweekendwithmywashing,butthenthosevisitsbecamelessregular.HowdidIletmyparentsknowIwascoming?Theyhadnophone.PerhapsIwrotetothem("ExpectmewithdirtyshirtsthisFridayafternoon"),butmorelikelyIdidn'tletthemknow,andjustt...