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 A—F
You are going to read a list of headings and a text about natural selection. Choose the most suitable heading from the list A—F
admin
2009-04-26
90
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 A—F for each numbered paragraph (41—45). 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/kei4777K
0
考研英语一
相关试题推荐
Themainideaofthefirstparagraphisthat______.Itcanbeinferredfromthepassagethat______.
Animportantfactorofleadershipisattraction.Thisdoesnotmeanattractivenessintheordinarysense,forthatisabornqua
Theauthorthinksthatpullfactors______.Peoplemovingwithincountrybordersareoftenmotivatedbythedesireto______.
Excitement,fatigue,andanxietycanallbedetectedfromsomeone’sblinks,accordingtopsychologistJohnStern(21)Washington
I’mnotsurewhetherIcangainanyprofitfromtheinvestment,soIcan’tmakea(an)______promisetohelpyou.
Accordingtothepassage,thefactthatyoungpeopleseemtobelosinginterestinscience______.Whichofthefollowingstate
Inthissection,youareaskedtowriteanessaybasedonthefollowingchart.Inyourwriting,youshould1)interpretthe
IwasaddressingasmallgatheringinasuburbanVirginialivingroom-awomen’sgroupthathadinvitedmentojointhem.Through
TherearemoredifferencesbetweentheUnitedStatesandJapanthanconflictingvaluesduringWorldWarII.Culturalandsocieta
Shouldaleaderstrivetobelovedorfeared?Thisquestion,famouslyposedbyMachiavelli,liesattheheartofJosephNye’sne
随机试题
这张照片让我想起了在上海度过的快乐时光。
A、张口受限B、复视C、耳鼻出血D、颅面分离E、咬错乱颧弓骨折常伴有
苯妥英钠抗癫痫作用是由于
下列各项中,属于各级财政部门对会计职业道德情况实施必要的行政监管主要措施的是()。
某校初中班主任吴老师在批改作业时,发现学生高某的作业本中夹了一封写有×××收的信件,吴老师顺便拆封阅读了此信。这是高某写给一位女同学的求爱信,吴老师看了十分生气,后在班会上宣读了此信,同时对高某提出了批评。次日高某在家留了一张字条后离家出走。高某家长
人民警察依法执行职务受法律保护,关于其内容说法错误的是()。
与2007年相比,2008年毕业人数增长率最高的是哪个专业?()
曲线y=x2+x(x<0)上曲率为的点的坐标是______.
进程P1、P2、P3、P4和P5的前趋图如图3—6:若用PV操作控制进程P1一P5并发执行的过程,则需要设置6个信号Sl、S2、S3、S4、S5和S6,且信号量s1一s6的初值都等于零。图3—7中a和b处应分别填写(23);c和d处应分别填写(24),
RobertFrostwasborninSanFranciscoin1875.Whenhewasattheageoften,hewassenttoNewEngland,anareawhich【B1】____
最新回复
(
0
)