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1、衡阳八中永州四中2016年下期高三年级实验班第一次联考英语一、听力二、阅读理解第一部分AAnarticlepublishedrecentlyinthescientificjournalNatureissheddingnewlightonanimportant,butsofarlittlehasbeenappreciated,aspectofhumanevolution.Inthisarticle,ProfessorsDennisBramble,andDanielLiebermansuggestthattheabilitytorunwasadecisivefactorinthede
2、velopmentofourspecies.Accordingtothetwoscientists,humanspossessanumberofanatomical（人体结构的）featuresthatmakethemsurprisinglygoodrunners.“Weareveryconfidentthatstrongselectionforrunning，whichcameattheexpenseofthehistoricalabilitytoliveintrees-washelpfulintheoriginofthemodernhumanbodyform,”saysBra
3、mble,abiologyprofessorattheUniversityofUtah.Traditionalthinkinguptonowhasbeenthattheuprightbodyformofmodernhumanshascomeaboutasaresultoftheabilitytowalk,andthatrunningissimplyaby-productofwalking.Furthermore,humanshaveusuallybeenregardedaspoorrunnerscomparedtosuchanimalsasdogs,horsesorantelop
4、es.However,thisisonlytrueifweconsiderfastrunningovershortdistances.EvenOlympicathletecanhardlyrunasfastasahorsecangallop,andcanonlykeepupatopspeedforfifteensecondsorso.Horsesandantelopes,ontheotherhand,canrunattopspeedforseveralminutes,clearlyoutperformingusinthisrespect.Butwhenitcomestolong-
5、distancerunning,humansdoastonishinglywell.Theycanmaintainasteadypaceformiles,andtheiroverallspeedcomparesfavorablywiththatofhorsesordogs.BrambleandLiebermanexaminedtwenty-sixanatomicalfeaturesfoundinhumans.Oneofthemostinterestingoftheseisthenuchalligament（颈背的韧带）.Whenwerun,itisthisligamentthat
6、preventsourheadfrompitchingbackandforthorfromsidetoside.Therefore,weareabletorunwithsteadyheadsheldhigh.Thenuchalligamentisnotfoundinanyothersurvivingprimates（灵长类动物）,althoughthefossil（化石）recordshowsthatHomoerectus,anearlyhumanspeciesthatwalkedupright,muchaswedo,alsohadone.ThenthereareourAchil
7、lestendons（跟腱）atthebacksofourlegs,whichhavenothingtodowithwalking.Whenwerun,thesetendonsbehavelikesprings,helpingtopushusforward.Furthermore,wehavelow,wideshoulders,virtuallydisconnectedfromourskulls(thebonypartofthehead),anotheranatomicalada
