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
考研
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
2016-06-22
12
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, by 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 has 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 year 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 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.
Which of the following statements is not natural selection?
选项
A、Male mortality.
B、Having less offspring.
C、Baby mortality.
D、Stable physical state.
答案
D
解析
本题考查对全文的总结能力。最后一段中讲述了人的体质这么多年来没有进化的原因。
转载请注明原文地址:https://kaotiyun.com/show/YvQi777K
0
在职申硕(同等学力)英语
相关试题推荐
Withthepossibleexceptionofequalrights,perhapsthemostcontroversialissueacrosstheUnitedStatestodayisthedeathpe
Withthepossibleexceptionofequalrights,perhapsthemostcontroversialissueacrosstheUnitedStatestodayisthedeathpe
Hardlyaweekgoesbywithoutsomeadvanceintechnologythatwouldhaveseemedincredible50yearsago.
PerhapsAsurprisinglytheBmainobstaclestoCrealizethisdreamDisneithertechnicalnorcommercial.
Ourbodiesarewonderfullyskillfulatmaintainingbalance.Whenthetemperaturejumps,wesweattocooldown.Whenourbloodpr
Learningdisabilitiesareverycommon.Theyaffectperhaps10percentofallchildren.Fourtimesasmanyboysasgirlshavelea
Youcanalways______Jiminacrisis,forheissimplythemosthelpfulpersonI’veeverknown.
Youmayhavewonderedwhythesupermarketsareallthesame.Itisnotbecausethecompaniesthatoperatethemlackimagination.
Heisan______boy,alwaysinsistingonhisownrightsandopinions.
Shealwayshandlestheproblems______herownexperienceandprinciples.
随机试题
20年前,大学毕业的刘姓夫妇与初中毕业的张姓夫妇各自的女儿在同一间产房出生,由于护士的疏忽,刘姓夫妇的女儿彤彤与张姓夫妇的女儿娟娟被调换。现在,被刘姓夫妇抚养的娟娟已经是音乐学院三年级的大学生。被张姓夫妇抚养的彤彤中专毕业后在家待业,两人命运迥异。有人认为
隋唐时期,三省六部制中的六部隶属于()
卡哈切迹主要见于的疾病是
公司信贷中,借款人原应付贷款利息和到期贷款须已清偿,才可进行下一轮贷款。()
变更票据上的金额的,属于票据的伪造,不属于票据的变造。()
材料在空气中吸收水气的能力称为()
唯物辩证法中,发展的实质是()。
计算二重积分,其中D={(x,y)|(x-1)2+(y—1)2≤2,y≥x}.
求区域Ω的体积V,其中Ω是半球面z=及旋转抛物面x2+y2=2az所围成.
属于交互式控件的是______。
最新回复
(
0
)