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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.Butthegreatuniversalofmalemorta
2、lityisbeingchanged.Now,boybabiessurvivealmostaswellasgirlsdo.Thismeansthat,forthefirsttime,therewillbeanexcessofboysinthosecrucialyearswhentheyaresearchingforamate.Moreimportant,anotherchancefornaturalselectionhasbeenremoved.Fiftyyearsago,thechanceof
3、ababy(particularlyaboybaby)survivingdependedonitsweight.Akilogramtoolightortooheavymeantalmostcertaindeath.Todayitmakesalmostnodifference.SincemuchoftheGengduoyuanxiaowanzhengkaoboyingyuzhentijiqijiexiqinglianxiquanguomianfeizixundianhua:silinglingli
4、uliubaliujiuqiba,huojiazixunqq:qiqierliuqibawusanqivariationisduetogenes,onemoreagentofevolutionhasgone.Thereisanotherwaytocommitevolutionarysuicide:stayalive,buthavefewerchildren.Fewpeopleareasfertileasinthepast.Exceptinsomereligiouscommunities,very
5、fewwomenhave15children.Nowadaysthenumberofbirths,liketheageofdeath,hasbecomeaverage.Mostofushaveroughlythesamenumberofoffspring.Again,differencesbetweenpeopleandtheopportunityfornaturalselectiontotakeadvantageofithavediminished.Indiashowswhatishappen
6、ing.Thecountryofferswealthforafewinthegreatcitiesandpovertywww.kaobo100.com中国考博辅导首选学校fortheremainingtribalpeoples.Thegrandmediocrityoftoday―everyonebeingthesameinsurvivalandnumberofoffspringmeansthatnaturalselectionhaslost80%ofitspowerinupper-middle-
7、classIndiacomparedtothetribes.Forus,thismeansthatevolutionisover;thebiologicalUtopiahasarrived.Strangely,ithasinvolvedlittlephysicalchange.Nootherspeciesfillssomanyplacesinnature.Butinthepast100,000years—eventhepast100years—ourliveshavebeentransforme
8、dbutourbodieshavenot.Wedidnotevolve,becausemachinesandsocietydiditforus.Darwinhadaphrasetodescribethoseignorantofevolution:“theylookatanorganicbeingasaveragelooksataship,asatsomethingwhollybeyondhiscomprehension.”Nodoubtwewillremembera20thcenturywayo
