雅思阅读材料之我们的祖先并没有那么聪明

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1、智课网IELTS备考资料雅思阅读材料之我们的祖先并没有那么聪明出国英语考试有哪些雅思6.5是什么水平雅思阅读评分标准托福阅读评分标准雅思和托福的区别AncestorofhumansnotsobrainyAmonkey-likeanimalseenasanancestorofmonkeys,apesandhumanswasnotasbrainy（1）asexpected,accordingtoscientistswhoanalyzeditsnicelypreserved29-million-year-oldskull.Thefindingindicatedthatprimate（2）braine

2、nlargementevolvedlaterthanoncethought,theresearcherssaidonMonday.Theyanalyzedaremarkablywell-preservedfossilized（3）skullofthelittleprimateAegyptopithecus（4）zeuxis,whichlivedinthetreesandatefruitandleavesabout29millionyearsagoinwarmforestsinwhatisnowanEgyptiandesert.Atechniquecalledmicrocomputerizedt

3、omography（5）scanning——acomputerizedX-raymethodalsocalledmicro-CT——allowedthemtodeterminethedimensionsoftheanimal'sbrain."Whatwasastonishingishowsmallthisbrainis,"DukeUniversityprimatologistElwynSimons,wholedthestudyintheProceedingsoftheNationalAcademyofSciences,saidinatelephoneinterview."Youcanalsos

4、eeit'saprettydarnprimitivebrain.Itwouldbesmallforamonkeyoranape,"Simonsadded."Soit'stellingusthatthespeedofachievementofbrainenlargementinprimateswasalittleslowerthanperhapswehadthought."Thisskullofasmallfemalewasuncoveredinaquarry（6）southwestofCairoin2004.Itwasbetterpreservedthananotherskullofalarg

5、ermaleofthespeciesfoundinthesameareain1966.Basedonearlierfinds,scientistshadtheorizedthespecieshadarelativelylargebrain.Instead,ithadabrainthatmighthavebeenevensmallerthanthatofamodernlemur,aprimatewithprimitivetraits.Simonssaidthatwhenthisprimatelived,Africawasanisland,limitingthecompetitionforsurv

6、ival.SimonssaidbrainenlargementmayhaveevolvedinthislineageafterAfricabecameconnectedtoAsia,bringinginmoreanimalsincludingnewanddangerouspredators."Brain-volumeenlargementisfavoredunderconditionsofcompetitionbecauseyouneedtobesmarter,"Simonssaid.1.brainy：有头脑的，聪明的2.primate：灵长类动物3.fossilize：变成化石4.aegyp

7、topithecus：埃及猿5.tomography：X线体层照相术，能够照出某确定物体上事先规定好的某层部分，而不会照下其它部分的像6.quarry：采石场科学家对一个保存良好的2900万年前的头骨进行研究，发现这种类猴的猴子、猿和人类祖先并没有预想得那么聪明。周一，研究人员们说此发现显示灵长类大脑进化时间比原来认为的要晚。这个小巧的古埃及猿头骨化石保存十分完好。此种灵长类动物生活在2900万年