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
2015-04-10
34
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 skins, so that, apart from color, we can build up a reasonably accurate picture of an animal that died millions of years ago. The 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 are also crab-like 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, or 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 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 starfishes, which had long arms and were attached by a long stalk to the seabed, 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.
【C3】
选项
答案
E
解析
仅从下文的also一词就可以判断,此处应讲述与crab—like creatures类似的东西,而且也应该在介绍某种化石。各选项中只有[E]讲述海中生物化石的形成以及种类,因此选[E]。选项大意是:目前发现的最古老的动物化石都是海中简单生物的化石。后来的生物形式越来越复杂,如海百合、海星类动物等,它们都有长长的触手,通过肉茎附着在海底或岩石上。
转载请注明原文地址:https://jikaoti.com/ti/enFRFFFM
0
考研英语一
相关试题推荐
Thefollowingparagraphsaregiveninawrongorder.ForQuestions41-45,youarerequiredtoreorganizetheseparagraphsintoa
Thefollowingparagraphsaregiveninawrongorder.ForQuestions41-45,youarerequiredtoreorganizetheseparagraphsintoa
Whichconditiondoestheauthorfeelhasnearlydestroyedourcities?Theauthorwrotethepassageinorderto
Whichconditiondoestheauthorfeelhasnearlydestroyedourcities?Whatcontributiondoestheauthorfeelpeoplemustmaken
Whichconditiondoestheauthorfeelhasnearlydestroyedourcities?Accordingtotheauthor,whatisoneexampleofourloss
Themaindifferencebetweenthemodemsuperfarmanddiversifiedfarmsis______Itcanbeseenfromthepassagethattheproblem
Therehasarisenduringthistwentiethcentury(asitarosebefore,inageswhichweliketocalldark)apronouncedantiintell
Therehasarisenduringthistwentiethcentury(asitarosebefore,inageswhichweliketocalldark)apronouncedantiintell
InthegrandschemeofthingsJeremyBenthamandJohnStuartMillarenormallythoughtofasgoodguys.Betweenthem,theycame
[A]Thesceneoccursveryneartheendofwhatmaybethebestsportsnoveleverwritten,EndZone,byDonDeLillo.Thehero,col
随机试题
简述幼儿再造想象的主要特点。
狭义的工程险主要包括()。
导致企业财产物资账存数与实存数不符的主要原因有()。
个人住房装修贷款的贷款对象应满足的条件不包括()
四川道琴又称“竹琴”,俗称“隔壁戏”,一般由一人扮演多个角色。()
下列哪一选项是蚊子用于获取“猎物”信息的主要器官:()
从所给四个选项中,选择最合适的填入1和2处,使之呈现一定的规律性:
1911年,美国工程师()出版《科学管理原理》一书,奠定了科学管理的理论基础,被誉为“科学管理之父”。
A、节日B、周末C、春节A
Howmanythingsarenecessarytolearnforeignlanguages?
最新回复
(
0
)