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
Long before Man lived on the Earth, there were fishes, reptiles, birds, insects, and some mammals. Although some of these animal
Long before Man lived on the Earth, there were fishes, reptiles, birds, insects, and some mammals. Although some of these animal
admin
2019-06-11
54
问题
Long before Man lived on the Earth, there were fishes, reptiles, birds, insects, and some mammals. Although some of these animals were ancestors of kinds living today, others are now extinct, that is, they have no descendants alive now.【C1】______.
Very occasionally the rocks show impression of skin, so that, apart from color, we can build up a reasonably accurate picture of an animal that died millions of years ago. That kind of rock in which the remains are found tells us much about the nature of the original land, often of the plants that grew on it, and even of its climate.
【C2】______. Nearly all of the fossils that we know were preserved in rocks formed by water action, and most of these are of animals that lived in or near water. Thus it follows that there must be many kinds of mammals, birds, and insects of which we know nothing.
【C3】______. There were also crablike creatures, whose bodies were covered with a horny substance. The body segments each had two pairs of legs, one pair for walking on the sandy bottom, the other for swimming. The head was a kind of shield with a pair of compound eyes, often with thousands of lenses. They were usually an inch or two long but some were 2 feet.
【C4】______. Of these, the ammonites are very interesting and important. They have a shell composed of many chambers, each representing a temporary home of the animal. As the young grew larger it grew a new chamber and sealed off the previous one. Thousands of these can be seen in the rocks on the Dorset Coast.
【C5】______.
About 75 million years ago the Age of Reptiles was over and most of the groups died out. The mammals quickly developed, and we can trace the evolution of many familiar animals such as the elephant and horse. Many of the later mammals though now extinct, were known to primitive man and were featured by him in cave paintings and on bone carvings.
[A]The shellfish have a long history in the rock and many different kinds are known.
[B]Nevertheless, we know a great deal about many of them because their bones and shells have been preserved in the rocks as fossils, from them we can tell their size and shape, how they walked, the kind of food they ate.
[C]The first animals with true backbones were the fishes, first known in the rocks of 375 million years ago. About 300 million years ago the amphibians, the animals able to live both on land and in water, appeared. They were giant, sometimes 8 feet long, and many of them lived in the swampy pools in which our coal seam, or layer is formed. The amphibians gave rise to the reptiles and for nearly 150 million years these were the principal forms of life on land, in the sea, and in the air.
[D]The best index fossils tend to be marine creatures. These animals evolved rapidly and spread over large over large areas of the world.
[E]The earliest animals whose remains have been found were all very simple kinds and lived in the sea. Later forms are more complex, and among these are the sea-lilies, relations of the star-fishes, which had long arms and were attached by a long stalk to the sea bed, or to rocks.
[F]When an animal dies, the body, its bones, or shell, may often be carried away by streams into lakes or the sea and there get covered up by mud. If the animal lived in the sea its body would probably sink and be covered with mud. More and more mud would fall upon it until the bones or shell become embedded and preserved.
[G]Many factors can influence how fossils are preserved in rocks. Remains of an organism may be replaced by minerals, dissolved by an acidic solution to leave only their impression, or simply reduced to a more stable form.
【C4】
选项
答案
A
解析
下文一开始就出现了指示代词these,这说明试题前面的句子表明了一类事物,也就是说, 试题部分应该有“some,several,many”或类似的词,对比答案只能是A项The shellfish have a long history in the rock and many different kinds are known.里面出现了many different kinds of,这 个短语和后面的指示代词these形成了对应关系。
转载请注明原文地址:https://kaotiyun.com/show/HI9Z777K
0
考研英语一
相关试题推荐
Wealreadyknowthatgenderbalancedseniorteamsarenotonlybetterforbusiness,theeconomyandsociety,butalsocrucialto
Itamazesmewhenpeopleproclaimthattheyarebored.Actually,itamazesmethatIameverbored,orthatanyofusare.With
Formanypeople,emotionsareascarything.【C1】______oftheproblemisthatwejustdon’tknowwhattodowiththem,according
TouristsweresurprisedtoseeawomandrivingahugeorangetractordownoneofRome’smainavenues.Italy’spoliticalleaders
"Ihavegreatconfidencethatbytheendofthedecadewe’llknowinvastdetailhowcancercellsarise,"saysmicrobiologistRo
"Ihavegreatconfidencethatbytheendofthedecadewe’llknowinvastdetailhowcancercellsarise,"saysmicrobiologistRo
"Ihavegreatconfidencethatbytheendofthedecadewe’llknowinvastdetailhowcancercellsarise,"saysmicrobiologistRo
Nowthattheeconomyisatlastgrowingagain,theburningissueinBritainisthecostofliving.Priceshaveexceededwagesfo
Itishardtomakemoneypeddlingsocialmediaanywhere.Duringtheirfirstfewyearsinbusiness,FacebookandTwitterlostpot
历史研究的方法论——1999年英译汉及详解【F1】Whiletherearealmostasmanydefinitionsofhistoryastherearehistorians,modernpracticemostc
随机试题
Nooneknowshowmanlearnedtomakewords.Perhapshebeganbymakingsoundslikethosemadebyanimals.Perhapshegruntedlik
甲、乙、丙、丁设立了宏达有限责任公司。甲以建设用地使用权认购出资500万元;乙以商标专用权认购出资600万元;丙以现金认购出资1000万元,但约定在公司成立2年内予以缴清:丁以一幅古画认购出资500万元。在公司的经营过程中,因资金紧张向A银行贷款500万元
竣工验收报告应当包括()等内容。
交通标志的主要作用是()。
在物价持续上升时,采用先进先出法会使发出存货成本偏高,利润偏低。()
按规定,半年度财务会计报告应于年度中期结束后()内对外提供。
贷款人可按中国人民银行《贷款通则》的规定,对借款人追究违约责任的情形有()。
企业发生的各项利得或损失,均应计入当期损益。()
______todothework,Ishoulddoitsomeotherday.
下列给定程序中,函数fun的功能是:在形参s所指字符串中寻找与参数c相同的字符,并在其后插入一个与之相同的字符,若找不到相同的字符则不做任何处理。例如,若s所指字符串为”baacda”,c中的字符为a,执行后s所指字符串为”baaaacdaa”。请在下
最新回复
(
0
)