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
63
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
F
解析
转载请注明原文地址:https://kaotiyun.com/show/Ryd4777K
0
考研英语一
相关试题推荐
Thispassageimpliesthatwarisnow______.Thelastparagraphsuggeststhat______.
Theauthor’spresentationofAtlanta’scar-dependenceismeantWhichofthefollowingisNOTmentionedinthetext?
Mostofusaretaughttopayattentiontowhatissaid—thewords.Wordsdoprovideuswithsomeinformation,butmeaningsare(1
Mostofusaretaughttopayattentiontowhatissaid—thewords.Wordsdoprovideuswithsomeinformation,butmeaningsare(1
Theauthor’spurposeinwritingthispassageisWhichofthefollowingbestdefinestheword"omission"(Paragraph6)?
WhichofthefollowingdoesnotapplytothemanagementofhumanresourcesinAmericancompanies?ComparedwithAmericanfirms,
DifferentgenerationsofAmericansmaybebestdividedwithregardtoFromthetextwelearnthatthe’68Warwasbestcharacte
ThepurposeoftheauthorinwritingthistextistoDespitesignsOfstrongeconomicrecovery,Americancompaniesarestillpr
EventheSaudis—orrather,thesmallnumberofmenwhoactuallyruletheirtroubledcountry—aregivinggroundinthestrugglefo
EventheSaudis—orrather,thesmallnumberofmenwhoactuallyruletheirtroubledcountry—aregivinggroundinthestrugglefo
随机试题
长期使用的列管式换热器,可以用化学和机械方法清除列管内外的污垢,这样做的目的是()。
某次产前检查测得孕妇宫底高度为12cm,腹围50cm,则估算出的胎儿体重是
下列属于调解书应当载明的内容的是()。
自然人甲通过签订合同授权自然人乙代理其进行证券投资,根据我国代理法律制度,()原因不会导致代理权终止。
股份有限公司
( )是指关于遗产由谁继承、继承哪项遗产及继承多少由被继承人依自己的意志立下的遗嘱来确定。
权威型教师往往严厉地管教学生,限制了学生自主性的发挥,忽视了()。
分析材料1与材料2在态度上发生了哪些变化?毛泽东说:“各项工作离开它,就要犯右倾或‘左’倾的错误。”结合农业社会主义改造的基本经验指出怎样开展工作才能不“离开它”?
CRT显示接口电路的字符发器实质上是一个将ASCII码转换成( )点阵代码的码制转换电路。
A、Workingasatouristguide.B、Workingasashopassistant.C、Helpinginarestaurant.D、Lookingafteralaboratory.C
最新回复
(
0
)