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
医学
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
2013-12-06
82
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 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 aad 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 changes. 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 average 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
在第三段中作者写道:“We did not evolve,because machines and society did it forus.”换言之,机器的使用、社会的进步使我们的生活发生了变化,即A“技术的进步提高了生活质量”。
转载请注明原文地址:https://kaotiyun.com/show/S8U3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
Thepresidentisill,sothesecretarywillbe______forhimaschairmanatthemeeting.
A、ThePresidentsignedtheletterB、ThePresidentheldthesoldier’shandtightlyC、Theyoungmanwentpeacefullythroughtohi
Mostexpertssaythatthenewtaxplanwillhaveanegligibleeffectonthecountry’seconomicproblems.
Ithasbeenprovedthatthechemicalislethaltoratsbutsafeforcattle.
A、Todosomeexperiments.B、Toattendaclass.C、Toreviewhislessons.D、Totakeatest.D由男士的话Ihaveanexaminabouttwentym
Iwasinvitedtopresentalecturetoaclassofgraduatenurseswhowerestudyingthe"PsychosocialAspectsofAging."Istar
FormonthsGinaCruz,aManilagrandmother,playedPepsiCola’s"NumbersFever"promotionlottery,buyingseveralbottlesaday
Howmuchpaindoanimalsfeel?Thisisaquestionwhichhascausedendlesscontroversy.Opponentsofbiggameshooting,forexam
Howmuchpaindoanimalsfeel?Thisisaquestionwhichhascausedendlesscontroversy.Opponentsofbiggameshooting,forexam
Britishscientistsarepreparingtolaunchtrialsofaradicalnewwaytofightcancer,whichkillstumoursbyinfectingthemwi
随机试题
Properarrangementofclassroomspaceisimportanttoencouraginginteraction.Today’scorporationshirehumanengineeringspec
简述审美经验中理解的特点。
下列哪项不是功血常用的辅助检查
A.超声心动图检查B.X线心脏三位相片检查C.心室及冠状动脉造影检查D.漂浮导管检查E.心电图运动负荷试验检查对左心功能判断最有价值
指导-合作型护患关系适用于()。
债券分为附息债券和零息债券的依据是( )。
有限合伙企业的有限合伙人不可以同本有限合伙企业进行交易。()
某工业企业为单步骤简单生产企业,设有一个基本生产车间,大量生产A、B两种产品;另设有供电、机修两个辅助生产车间,为全厂提供产品和劳务。根据生产特点和管理要求,A、B两种产品采用品种法计算产品成本。该企业2014年5月份有关成本资料如下:(1)A、B两种产
某学校学生、教师和课程实体对应的关系模式如下:学生(学生号,姓名,性别,年龄,家庭住址,电话)课程(课程号,课程名)教师(职工号,姓名,年龄,家庭住址,电话)如果一个学生可以选修多门课程,一门课程可以有多个学生选修;一个教师
Accordingtothepassage,whichofthefollowinghaschangedthemostinthelast500years?______Coffeeoriginallycamefrom
最新回复
(
0
)