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 balanc
Being a man has always been dangerous. There are about 105 males born for every 100 females, but this ratio drops to near balanc
admin
2016-11-21
42
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 percent 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 fill’s 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 something 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.
The author argues that our bodies have stopped evolving because______.
选项
A、life has been improved by technological advance
B、the number of female babies has been declining
C、our species has reached the highest stage of evolution
D、the difference between wealth and poverty is disappearing
答案
A
解析
判断推理题。在第三段作者指出:对于我们,这意味着进化已经结束;生物的理想社会已经到来。奇怪的是,人类在身体方面几乎没有什么进化。没有哪个种群像人类这样遍布自然界各个角落,但在过去10万年——甚至过去100年,我们的生活改变了,但身体并无变化。我们没有进化,其原因是机器和社会为我们完成了进化。故选A。
转载请注明原文地址:https://kaotiyun.com/show/DHJK777K
0
专业英语四级
相关试题推荐
EveryFebruary,acrossthecountry,candy,flowers,andgiftsareexchangedbetweenlovedones,allinthenameofSt.Valentine
Mostpeoplefeelstressatsometimeintheirlives.Somepeoplelikethispressureandworkbetterbecauseofit.Otherpeople
There’ssomethingabouttheInternetthatcanbringoutmeannessinteenagers.Thatisonefindingofastudytobereleased
We’realwaysbeingtoldbytheDepartmentofHealthtoeatfiveportionsoffruitandvegetablesaday.Butit’snotclearwhere
Anewgenerationofmind-enhancingdrugsthatactas"cosmetics"forthebraincouldbecomeascommonasacupofcoffee,accord
Mostpeoplewhogoonlinehavemainlypositiveexperience.But,【C1】______anyendeavor—traveling,cooking,orattendingschool—t
Hearguedforcefullyand______thattheywerelikelytobankruptthebudget.
Oneofthemostcommonhumanfearsisscarcity.Manypeopleareafraidofnothavingenoughofwhattheyneedorwant,andsoth
PresidentEnriquePenaNietohasencouragedMexicanstowalkmore,usestairsandexerciseonehoureverydayashelaunchedac
Britainhasannouncedthatitistocancelabout200millionpounds’worthofdebts【D1】______itbypoorerCommonwealthcountrie
随机试题
下列选项中,按照作品创作年代先后顺序排列的一组是【】
护生小王,在带教老师的监督下进行静脉输液,因未严格查对,错将22床青霉素输给21床患者,导致21床患者发生过敏性休克而死亡。该事故属于
潇湘公司为支付货款向楚天公司开具一张金额为20万元的银行承兑汇票,付款银行为甲银行。潇湘公司收到楚天公司货物后发现有质量问题,立即通知甲银行停止付款。另外,楚天公司尚欠甲银行贷款30万元未清偿。下列哪些说法是错误的?()
制订招标采购项目进度计划的依据包括()。
已知:某松螺栓连接,所受最大载荷FQ=15000N,载荷很少变动,螺栓材料的许用应力[σ]=140MPa,则该螺栓的最小直径d1为()。
依据《建设工程消防监督管理规定》,下列建设工程在工程竣工后不需要向出具消防设计审核意见的公安机关消防机构申请消防验收的是()。
假设美国的利率是6%,人民币的利率是2%,则3个月的远期美元对人民币()。
为向教师和学生不断提供学习成败的反馈,制定或修改教学计划,而在教学过程中进行的测量称为()。
北宋制瓷业中的五大名窑是官窑、钧窑、________、_______和________。在瓷器上雕画________是北宋时的新创。
第四点计划
最新回复
(
0
)