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1、www.kaobo100.com中国考博辅导首选学校清华大学考博英语阅读题及其解析Beingamanhasalwaysbeendangerous.Thereareabout105malesbornforevery100females,butthisratiodropstonearbalanceattheageofmaturity,andamong70-year-oldstherearetwiceasmanywomenasmen.Butthegreatuniversalofmalemortalityisbeingch
2、anged.Now,boybabiessurvivealmostaswellasgirlsdo.Thismeansthat,forthefirsttime,therewillbeanexcessofboysinthosecrucialyearswhentheyaresearchingforamate.Moreimportant,anotherchancefornaturalselectionhasbeenremoved.Fiftyyearsago,thechanceofababy(particularlyaboyb
3、aby)survivingdependedonitsweight.Akilogramtoolightortooheavymeantalmostcertaindeath.Todayitmakesalmostnodifference.SincemuchoftheGengduoyuanxiaozhentijiqijiexiqinglianxiquanguomianfeizixundianhua:silinglingliuliubaliujiuqiba,huojiazixunqq:qiqierliuqibawusanqiv
4、ariationisduetogenes,onemoreagentofevolutionhasgone.Thereisanotherwaytocommitevolutionarysuicide:stayalive,buthavefewerchildren.Fewpeopleareasfertileasinthepast.Exceptinsomereligiouscommunities,veryfewwomenhave15children.Nowadaysthenumberofbirths,liketheageofd
5、eath,hasbecomeaverage.Mostofushaveroughlythesamenumberofoffspring.Again,differencesbetweenpeopleandtheopportunityfornaturalselectiontotakeadvantageofithavediminished.Indiashowswhatishappening.Thecountryofferswealthforafewinthegreatcitiesandpovertywww.kaobo100.
6、com中国考博辅导首选学校fortheremainingtribalpeoples.Thegrandmediocrityoftoday―everyonebeingthesameinsurvivalandnumberofoffspringmeansthatnaturalselectionhaslost80%ofitspowerinupper-middle-classIndiacomparedtothetribes.Forus,thismeansthatevolutionisover;thebiologicalUtop
7、iahasarrived.Strangely,ithasinvolvedlittlephysicalchange.Nootherspeciesfillssomanyplacesinnature.Butinthepast100,000years—eventhepast100years—ourliveshavebeentransformedbutourbodieshavenot.Wedidnotevolve,becausemachinesandsocietydiditforus.Darwinhadaphrasetode
8、scribethoseignorantofevolution:“theylookatanorganicbeingasaveragelooksataship,asatsomethingwhollybeyondhiscomprehension.”Nodoubtwewillremembera20thcenturywayoflifebeyondcomprehensi
