首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Being a man has always been dangerous. There are about 105 males born for every 100 females , but this ratio drops to near balan
Being a man has always been dangerous. There are about 105 males born for every 100 females , but this ratio drops to near balan
admin
2015-08-09
40
问题
Being a man has always been dangerous. There are about 105 males born for every 100 females , but this ratio drops to near balance at the age of maturity, and among 70-year-olds there are twice as many women as men. But the great universal of male mortality is being changed. Now, boy babies survive almost as well as girls do. This means that, for the first time, there will be an excess of boys in those crucial years when they are searching for a mate. More important, another chance for natural selection has been removed. Fifty years ago, the chance of a baby (particularly a boy baby) surviving depended on its weight. A kilogram too light or too heavy meant almost certain death. Today it makes almost no difference. Since much of the variation is due to genes, one more agent of evolution has gone.
There is another way to commit evolutionary suicide: stay alive, but have fewer children. Few people are as fertile as in the past. Except in some religious communities, very few women have 15 children. Nowadays the number of births, like the age of death, has become average. Most of us have roughly the same number of offspring. Again, differences between people and the opportunity for natural selection to take advantage of it have diminished. India shows what is happening. The country offers wealth for a few in the great cities and poverty for the remaining tribal peoples. The grand mediocrity of today—everyone being the same in survival and number of offspring—means that natural selection has lost 80% of its power in upper-middle-class India compared to the tribes.
For us, this means that evolution is over; the biological Utopia has arrived. Strangely, it has involved little physical change. No other species fills so many places in nature. But in the past 100, 000 years—even the past 100 years—our lives have been transformed but our bodies have not. We did not evolve, because machines and society did it for us. Darwin had a phrase to describe those ignorant of evolution: they "look at an organic being as a savage looks at a ship, as at some-thing wholly beyond his comprehension". No doubt we will remember a 20th century way of life beyond comprehension for its ugliness. But however amazed our descendants may be at how far from Utopia we were, they will look just like us.
What does the example of India illustrate?
选项
A、Wealthy people tend to have fewer children than poor people.
B、Natural selection hardly works among the rich and the poor.
C、The middle class population is 80% smaller than that of the tribes.
D、India is one of the countries with a very high birth rate.
答案
B
解析
本文第二段最后两句话表示这个国家给大城市的一部分人提供了财富,而其余的部落民族却一贫如洗。今天众多的普通人,每个人在存活子女的数量方面都一样,这意味着:与部落相比,自然选择在印度的中上阶层已失去了80%的效应。这与B中的“自然选择在富人与穷人中已很难起作用”的意思相吻合,故应选B。A富人生的孩子没有穷人生得多,与上面的表述相矛盾。C中等阶层的人口比部落人口少80%和D印度是个高出生率的国家,文中都未提及。
转载请注明原文地址:https://kaotiyun.com/show/bmRd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
D.H.LawrenceisoneofthegreatestEnglishnovelistsofthe20thcentury,and,perhaps,thegreatestfromaworking-classfam
Allthewisdomoftheages,allthestoriesthathavedelightedmankindforcenturies,areeasilyandcheaply【21】______toal
Allthewisdomoftheages,allthestoriesthathavedelightedmankindforcenturies,areeasilyandcheaply【21】______toal
Allthewisdomoftheages,allthestoriesthathavedelightedmankindforcenturies,areeasilyandcheaply【21】______toal
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand1
Whyarewefarfromsatisfiedwithourbasicneeds?
Competitionforadmissiontothecountry’stopprivateschoolshasalwaysbeentough,butthisyearElisabethrealizedithadre
Thebigidentity-theftbustlastweekwasjustatasteofwhat’stocome.Here’showtoprotectyourgoodname.HERE’STHES
Thebigidentity-theftbustlastweekwasjustatasteofwhat’stocome.Here’showtoprotectyourgoodname.HERE’STHES
Whyarewefarfromsatisfiedwithourbasicneeds?
随机试题
下列四式中正确的是()。
对小儿高热惊厥有效的药物是()。
甲系某地交通运输管理所工作人员,在巡查执法时致一辆出租车发生重大交通事故,司机乙重伤,乘客丙当场死亡,出租车严重受损。甲以滥用职权罪被提起公诉。关于本案处理,下列哪一选项是正确的?(2017年卷二28题,单选)
【2008年真题】关于网络计划,说法正确的是()。
一、背景2006年某机电安装公司承担了某化工项目,在一条材质为15CrMo的压力管道现场组对、焊接(手工焊)完成后,无损检测时发现多道焊口不合格。监理工程师会同项目质量技术部门进行了检查分析,发现以下问题:(1)对参与焊接的10名焊工进
某食品加工厂雇佣职工10人,资产总额200万元,税务机关对其2011年经营业务进行检查时发现食品销售收入为50万元、转让国债收入4万元、国债利息收入1万元,但无法查实成本费用。税务机关采用核定办法对其征收所得税,应税所得率为15%。2011年该食品加工厂应
甲公司是一家制造业上市公司,目前公司股票每股38元,预计股价未来增长率7%;长期借款合同中保护性条款约定甲公司长期资本负债率不可高于50%、利息保障倍数不可低于5倍。为占领市场并优化资本结构,公司拟于2019年年末发行可转换债券筹资20000万元。为确定筹
心理咨询师的真诚,应该体现在()。
设A为n阶非奇异矩阵,α为n维列向量,b为常数.记分块矩阵其中A*是矩阵A的伴随矩阵,E为n阶单位矩阵.证明:矩阵Q可逆的充分必要条件是αTAα-1≠b.
已知R1=0x50001000,R2=0x00080001,执行ARM指令MOVR1,R2,LSL#8后,R1的值为()。
最新回复
(
0
)