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
You are going to read a list of headings and a text about natural selection. Choose the most suitable heading from the list for
You are going to read a list of headings and a text about natural selection. Choose the most suitable heading from the list for
admin
2013-06-10
49
问题
You are going to read a list of headings and a text about natural selection. Choose the most suitable heading from the list for each numbered paragraph. The first and last paragraphs of the text are not numbered. There is one extra heading which you do not need to use.
A. The impotence of creationism.
B. Natural selection acts by competition.
C. The role of natural selection in this colorful world
D. The delicate hierarchy of the natural system.
E. The agency of selection can account for more cases.
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.
(41)______.
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.
(42)______.
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.
(43)______.
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.
(44)______.
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.
(45)______.
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.
选项
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/Cyd4777K
0
考研英语一
相关试题推荐
Inthefollowingtext,somesentenceshavebeenremoved.ForQuestions41-45,choosethemostsuitableonefromthelist(A、B、C、
Radiationoccursfromthreenaturalsources:radioactivematerialintheenvironment,suchasinsoil,rock,orbuildingmateria
Intheeyesoftheauthor,conventionalopiniononthestrategicimportanceoftheGulfoilisWhensaying"itisstillahefty
Mostofusaretaughttopayattentiontowhatissaid—thewords.Wordsdoprovideuswithsomeinformation,butmeaningsare(1
Mostofusaretaughttopayattentiontowhatissaid—thewords.Wordsdoprovideuswithsomeinformation,butmeaningsare(1
TheauthorassertsthatremedyingtheearthatmospherewilldependuponothermeasuresthanAccordingtothetext,whatencoura
Themainpointofthisarticleisthat______.Theword"rapport"(Sentence1,Paragraph1)probablymeans______.
TheoverallattitudeofthewritertowardstheFrenchsoccerteamis______.Theword"crown"attheendofparagraph3issimi
WhichofthefollowingdoesnotapplytothemanagementofhumanresourcesinAmericancompanies?Accordingtothepassage,the
Feelinganxious?Yourmoodmayactuallychangehowyourdinnertastes,makingthebitterandsaltyflavorsrecede,accordingto
随机试题
女性,45岁,皮疹半年,加重伴高热1周,伴活动后轻度的呼吸困难,辅助检查提示:尿蛋白1.0g/L,超声心动检查提示肺动脉高压,患者1日前无明显诱因突发抽搐,10分钟后自行缓解,头颅CT检查未见异常表现
我们平时习惯称为“二灰土”的基层是属于()。
下列关于货币现值和终值的说法中,错误的有()。
甲公司为上市公司,2011年至2013年的有关资料如下:甲公司归属于普通股股东的净利润2011年度为24600万元,2012年度为31211.25万元,2013年度为45264万元。甲公司股票2011年6月至2011年12月平均市场价格为每股10元,201
分析有关城市化及产业结构的图文资料。回答问题。从各国城市化的实践出发。现代城市化新概念是指人类社会活动的生产要素从农村地区向城市地区转移的过程,即包含人口城市化和经济城市化。经济城市化是指城市的财富积累状态,通常以城市建成区内各类生产活动所产生的GDP(国
在很多竞技体育项目中,运动员坚强的意志、顽强的精神是取得胜利的基础,只要顽强地拼搏,即使失败,也会赢得人们的尊敬。从哲学角度看,这种意志和精神体现了()
小学儿童掌握社会性概念的转折点在哪个年级?()
愿景
感染计算机病毒的原因之一是_______。
Britishteenagersaredamagingtheirhealthbynotgettingenoughsleepbecausetheyaredistractedbyelectronicgadgetsinthe
最新回复
(
0
)