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 sele
[A] The role of natural selection in this colorful world [B] The delicate hierarchy of the natural system [C] The agency of sele
admin
2017-10-23
24
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.
The long and progressive reign of Queen Victoria came to a climax at a time of peace and plenty when the British Empire seemed to be at the summit of its power and security. Of the discord that soon followed we shall here note only two factors which had large influence on contemporary English literature.
【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自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://jikaoti.com/ti/x1k7FFFM
0
考研英语一
相关试题推荐
Prettyinpink:adultwomendonotrememberbeingsoobsessedwiththecolour,yetitispervasiveinouryounggirls’lives.It
Inspiteof"endlesstalkofdifference",Americansocietyisanamazingmachineforhomogenizingpeople.Thereis"thedemocrat
Manyareawareofthetremendouswasteofenergyinourenvironment,butfailtotakeadvantageofstraightforwardopportunities
Thoughnotbiologicallyrelated,friendsareas"related"asfourthcousins,sharingabout1%ofgenes.Thatis【C1】______astudy
AsValentine’sDayapproaches,manysinglepeoplebegintofeelalittlesorryforthemselves.Onaday【C1】______bycouples,thi
TheaverageBritishpeoplegetsix-and-a-halfhours’sleepanight,accordingtotheSleepCouncil.Ithasbeenknownforsomet
Maybeunemploymentisn’tsobadafterall.Anewstudysaysthathavingademanding,unstableandthanklessjobmaymakeyoueve
Maybeunemploymentisn’tsobadafterall.Anewstudysaysthathavingademanding,unstableandthanklessjobmaymakeyoueve
Havetherealwaysbeencities?Thetrendiscitiesareincreasinglybecomingthedominantmodeofman’ssocialexistence.【F1】It
随机试题
价值观是一个人关于()的基本信念。
泪溢的原因中不包括
可摘义齿固位体应该具备的条件是必须提供足够的
A.LeFortⅠ型骨折B.LeFortⅡ型骨折C.LeFortⅢ型骨折D.不对称型骨折E.纵行骨折骨折线从梨状孔下方、牙槽突上方两侧水平方向延伸至上颌翼突缝()
女性,45岁。3年前出现右下肢行走10分钟后胀痛,休息片刻缓解,再行走后疼痛又出现,发病前半年右足部外伤已治愈。体格检查:右下肢皮色较苍白,右足背动脉未触及,无明显水肿。诊断最可能是
危险化学品生产、储存企业,除必须具备有符合国家标准的生产工艺、设备或者储存方式、设施的条件,还应具备条件
水利工程主体工程开工必须具备的条件是()。
有效的绩效管理体系在绩效管理的实施阶段中,涉及以下几个环节,请选出正确的排序。()
教师对学生的表扬是一种激发学生学习的积极诱因。
18种法定公文的法定依据是()。
最新回复
(
0
)