考研英语（阅读）模拟试卷536 什么是文艺(题后含答案及解析)
乙酸乙酯的密度
全部题型 2. Reading Comprehension
古巴共和国
Section II Reading Comprehension
wps表格打印Part B (10 points)
微信接收的文件涿鹿中学 Long before Man lived on the Earth, there were fishes, reptiles, birds, incts, and some mammals. Although some of the 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 prerved in rocks formed by water action, and most of the are of animals that lived in or near water. Thus it follows that there must be many kinds of mammals, birds,
劳动评价and incts of which we know nothing. 【C3】______. There were also crablike creatures, who bodies were covered with a horny substance. The body gments 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 lens. They were usually an inch or two long but some were 2 feet. 【C4】______. Of the, the ammonites are very interesting and important. They have a shell compod of many chambers, each reprenting a temporary home of the animal. As the young grew larger it grew a new chamber and aled off the previous one. Thousands of the can be en in the rocks on the Dort 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 hor. 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 becau their bones and shells have been prerved 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 am, or layer is formed. The amphibians gave ri to the reptiles and for nearly 150 million years the were the principal forms of life on land, in the a, and in the air. [D]The best index fossils tend to be marine creatures. The animals evolved rapidly and spread over large over large areas of the world. [E]The earliest animals who remains have been found were all very simple kinds and lived in the a. Later forms are more complex, and among the are the a-lilies, relations of the star-fishes, which had long arms and were attached by a long stalk to the a 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 a and there get covered up by mud. If the animal lived in the a 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 prerved. [G]Many factors can influence how fossils are prerved 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.
100句非常经典的读书名言
