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1、www.kaobo100.com中国考博辅导首选学校华东师范大学考博英语模拟试题及其解析Beingamanhasalwaysbeendangerous.Thereareabout105malesbornforevery100females,butthisratiodropstonearbalanceattheageofmaturity,andamong70-year-oldstherearetwiceasmanywomenasmen.Butthegreatuniversalofmalemortalityisbeingchanged.Now,boybabiessurvivealmo
2、staswellasgirlsdo.Thismeansthat,forthefirsttime,therewillbeanexcessofboysinthosecrucialyearswhentheyaresearchingforamate.Moreimportant,anotherchancefornaturalselectionhasbeenremoved.Fiftyyearsago,thechanceofababy(particularlyaboybaby)survivingdependedonitsweight.Akilogramtoolightortooheavymea
3、ntalmostcertaindeath.Todayitmakesalmostnodifference.SincemuchoftheGengduoyuanxiaowanzhengkaoboyingyuzhentijiqijiexiqinglianxiquanguomianfeizixundianhua:silinglingliuliubaliujiuqiba,huojiazixunqq:qiqierliuqibawusanqivariationisduetogenes,onemoreagentofevolutionhasgone.Thereisanotherwaytocommit
4、evolutionarysuicide:stayalive,buthavefewerchildren.Fewpeopleareasfertileasinthepast.Exceptinsomereligiouscommunities,veryfewwomenhave15children.Nowadaysthenumberofbirths,liketheageofdeath,hasbecomeaverage.Mostofushaveroughlythesamenumberofoffspring.Again,differencesbetweenpeopleandtheopportun
5、ityfornaturalselectiontotakeadvantageofithavediminished.Indiashowswhatishappening.Thecountryofferswealthforafewinthegreatcitiesandpovertywww.kaobo100.com中国考博辅导首选学校fortheremainingtribalpeoples.Thegrandmediocrityoftoday―everyonebeingthesameinsurvivalandnumberofoffspringmeansthatnaturalselection
6、haslost80%ofitspowerinupper-middle-classIndiacomparedtothetribes.Forus,thismeansthatevolutionisover;thebiologicalUtopiahasarrived.Strangely,ithasinvolvedlittlephysicalchange.Nootherspeciesfillssomanyplacesinnature.Butinthepast100,000years—eventhepast100years—ourliveshavebeentransformedbutourb
7、odieshavenot.Wedidnotevolve,becausemachinesandsocietydiditforus.Darwinhadaphrasetodescribethoseignorantofevolution:“theylookatanorganicbeingasaveragelooksataship,asatsomethingwhollybeyondhiscomprehension.”Nodoubtwewillremembera20thcenturywayo
