《考研英语七选五模拟练习(共3页).doc》由会员分享，可在线阅读，更多相关《考研英语七选五模拟练习(共3页).doc（3页珍藏版）》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、精选优质文档-倾情为你奉上考研英语七选五模拟练习Directions:In the following text, some sentences have been removed. For Questions 41-45, choose the most suitable one from the list A-G to fit into each of the numbered blanks. There are two extra choices, which do not fit in any of the blanks. Mark your answers on ANSWER SHE
2、ET 1. (10 points)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. 41) _ Very occasionally the rocks show impress
3、ion of skin, 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.42) _.
4、 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.43) _ There were also crab-like creatures, whose
5、 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
6、 2 feet.44) _. 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
7、 Dorset Coast.45) _.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 m
8、an and were featured by him in cave paintings and on bone carvings.AThe shellfish have a long history in the rock and many different kinds are known.BNevertheless, 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 tel
9、l their size and shape, how they walked, the kind of food they ate.CThe 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, som
10、etimes 8 feet long, and many of them lived in the swampy pools in which our coal seam, or layer, 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.DThe best index fossils tend to be marine crea
11、tures. These animals evolved rapidly and spread over large areas of the world.EThe 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 w
12、ere attached by a long stalk to the sea bed, or to rocks.FWhen an animal dies, the body, its bones, or shell, may often be carried away by streams into lakes or the sea arid 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 mor
13、e mud would fall upon it until the bones or shell become embedded and preserved.GMany 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.七(六)选五41. B 42. F 43. E 44. A 45. C小提示：目前本科生就业市场竞争激烈，就业主体是研究生，在如今考研竞争日渐激烈的情况下，我们想要不在考研大军中变成分母，我们需要：早开始+好计划+正确的复习思路+好的辅导班（如果经济条件允许的情况下）。2017考研开始准备复习啦，早起的鸟儿有虫吃，一分耕耘一分收获。加油！专心-专注-专业