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
[A]The role of natural selection in this colorful world [B]The delicate hierarchy of the natural system [C]The agency of
[A]The role of natural selection in this colorful world [B]The delicate hierarchy of the natural system [C]The agency of
admin
2016-11-11
67
问题
[A]The role of natural selection in this colorful world
[B]The delicate hierarchy of the natural system
[C]The agency of selection can account for more cases
[D]The impotence of creationism
[E]Natural selection acts by competition
[F]No leaps in natural evolution
As each species tends by its geometrical rate of reproduction to increase excessively in number: and as the modified descendants of each species will be enabled to increase by as much as they become more diversified in habits and structure, so as to be able to seize on many and widely different places in natural selection to preserve the most divergent offspring of any one species. Hence, during a long-continued course of modification, the slight differences characteristic of varieties of the same species, tend to be augmented into the greater differences characteristic of the species of the same genus.
【C1】______
New and improved varieties will inevitably displace and destroy the older, less improved, and intermediate varieties: and thus species are rendered to a large extent defined and distinct objects. Dominant species belonging to the larger groups within each class tend to give birth to new and dominant forms: so that each large group tends to become still larger, and at the same time more divergent in character. But as all groups cannot thus go on increasing in size, for the world would not hold them, the more dominant groups beat the less dominant.
【C2】______
This tendency in the large groups to go on increasing in size and diverging in character, together with the inevitability of much extinction, explains the arrangement of all the forms of life in groups subordinate to groups, all within a few great classes, which has prevailed throughout all time. This grand fact of the grouping of all organic beings under what is called the Natural System, is utterly unexplainable on the theory of creation.
【C3】______
As natural selection acts solely by accumulating slight, successive, favorable variations, it can produce no great or sudden modifications: it can act only by short and slow steps. We can see why throughout nature the same general end is gained by an almost infinite diversity of means, for every peculiarity when once acquired in long inherited, and structures already modified in many different ways have to be adapted for the same general purpose. We can, in short, see why nature is extravagant in variety, though not generous in innovation. But why this should be a law of nature if each species has been independently created no man can explain.
【C4】______
Many other facts are, as it seems to me, explicable on this theory. How strange it is that a bird, under the form of a woodpecker, should prey on insects on the ground and that upland geese which rarely or never swim, should possess webbed feet, and so in endless other cases. But on the view of each species constantly trying to increase in number, with natural selection always ready to adapt the slowly varying descendants of each to any unoccupied or ill-occupied place in nature, these facts cease to be strange, or might even have been anticipated.
【C5】______
We can to a certain extent understand how it is that there is so much beauty throughout nature: for this may be largely attributed to the agency of selection. That beauty, according to our sense of it, is not universal, must be admitted by every one who will look at some hideous bats with a distorted resemblance to the human face. Sexual selection has given the most brilliant colors, elegant patterns, and other ornaments to the males. With birds it has often rendered the voice of the male musical to the female, as well as to our ears. Flowers and fruit have been rendered conspicuous by brilliant colors in contrast with the green foliage, in order that the flowers may be readily seen, visited and fertilized by insects.
As natural selection acts by competition, it adapts and improves the inhabitants of each country only in relation to their co-inhabitants: so that we need feel no surprise at the species of any one country being beaten and supplanted by the naturalized productions from another land. The wonder indeed is, on the theory of natural selection, that more cases of the want of absolute perfection have not been detected.
【C4】
选项
答案
C
解析
第五段指出:有些物种都在尝试增加数目,作者举了类似啄木鸟形态的鸟、高地的鹅等例子来说明白然选择是在使每一物种的缓慢变异着的后代适应于自然界中未被占据或占据不好的地方,C项“选择的力量可以解释许多个例”更好地总结了这一段。
转载请注明原文地址:https://kaotiyun.com/show/iWoZ777K
0
考研英语一
相关试题推荐
PublichealthofficialsgrapplingwiththeobesityepidemichavedebatedawiderangeofapproachestohelpingslimtheAmerican
Whatmakesagreathighschool?Americansthinkalotofthingsdo,fromoutstandingacademicsorasupportiveenvironmentfors
Prewritingreferstostrategiesyoucanusetogenerateideasbeforestartingthefirstdraftofapaper.Prewritingtechniques
Researchhasshownthat—inbothsexesandacrossnumerouscultures—attractivepeoplearejudgedtobesmarter,kinder,morehone
Researchhasshownthat—inbothsexesandacrossnumerouscultures—attractivepeoplearejudgedtobesmarter,kinder,morehone
Marriageis,formanypeople,theirmostimportantrelationship,thesourceofmuchhappiness,and,forsome,evenaddsextraye
Therigidhigher-educationbusinessisabouttoexperienceawelcomeearthquake.Traditionaluniversitiesnowfaceanew【C1】____
TheFederalTradeCommissionhadsomesharpwordsforInternetcompaniesThursday,sayingthattheyarenotexplainingtotheir
Theirdefenderssaytheyaremotivated,versatileworkerswhoarejustwhatcompaniesneedinthesedifficulttimes.Toothers,
随机试题
轻便消防水龙的喷枪应带有开关,且“开”与“关”的转换功能应由一个动作完成。对于直流喷雾枪,其调节喷雾角的旋转开关的关闭方向从喷枪的进口看应是顺时针方向。()
期货交易所一般实行_______。
人们在遇到压力、痛苦、困境时,引起自杀的主要原因是
中医学认为,妊娠恶阻(妊娠剧吐)的治疗原则是
[2012年,第24题]设x1、x2,…,xn是来自总体N(μ,σ2)的样本,μ、σ2未知,则检验假设H0:μ=0时应选取的统计量是()。
政府财政支出效益分析与微观经济组织生产经营支出效益分析的差别主要表现为()。
我国的现有商业模式主要有()
技术扩散是创新的技术在其他经济领域和更大地域空间范围的应用推广。从地理角度看.技术扩散是技术在空间上的流动和转移,由新技术的供方、受方、传递渠道组成。根据上述定义,下列属于技术扩散的是()。
有如下程序:#include<iostream>usingnamespacestd;classAA{intn;public:AA(intk):n(k){}intget0{re
Accordingtothepassage,theU.S.elementaryeducationissupposedtomakechildren______.SomeAmericanscomplainaboutelem
最新回复
(
0
)