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銆€銆€Part B

銆€銆€Directions:

銆€銆€In the following article, some sentences have been removed. For Questions 41~ 45, choose the most suitable one from the list 锛籄锛絶锛籊锛� to fit into each of the numbered blanks. There are two extra choices which do not fit in any of the gaps. Mark your answers on ANSWER SHEET 1. (10 points)

銆€銆€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) .

銆€銆€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. 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.

銆€銆€(42) . 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.

銆€銆€(43) . There were 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.

銆€銆€(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 Dorset Coast.

銆€銆€(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 man and were featured by him in cave paintings and on bone carvings.

銆€?銆傝窐锛絋he shellfish have a long history in the rock and many different kinds are known.

銆€銆€锛籅锛� 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.

銆€銆€锛籆锛絋he first animals with true backbones were 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, 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.

銆€?銆傝窢锛絋he best index fossils tend to be marine creatures. These animals evolved rapidly and spread over large areas of the world.

銆€銆€锛籈锛絋he 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.

銆€?銆傝发锛絎hen 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 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.

銆€銆€锛籊锛組any 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.

銆€銆€瑙ｉ鎬濊矾锛�

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銆€銆€绗�45椤岀偤涓€娈点€備笅涓€娈垫彁鍒�锛屽ぇ绱�7 500钀勾鍓嶏紝鐖鍕�(d貌ng)鐗╂檪(sh铆)浠ｇ祼(ji茅)鏉熶簡锛屽叾涓ぇ閮ㄥ垎鐗╃ó閮芥粎绲曚簡銆傝€屽摵涔冲嫊(d貌ng)鐗╄繀閫熺櫦(f膩)灞曡捣渚�锛屾垜鍊戝彲浠ヨ拷灏嬪嚭瑷卞韫よ贰锛屽€熸浜嗚В瑷卞澶у鐔熸倝鐨勫嫊(d貌ng)鐗╁澶ц薄鍜岄Μ鐨勯€�(j矛n)鍖栭亷绋�銆傚悗渚嗙殑瑷卞鍝轰钩鍕�(d貌ng)鐗�锛岄洊鐒剁従(xi脿n)鍦ㄥ凡缍�(j墨ng)婊呯禃浜�锛岄倓鏄鍘熷浜洪鎵€浜嗚В锛屽苟琚暙鍦ㄤ簡澹佺暙涓垨琚洉鍒诲湪浜嗛闋笂銆傛敞鎰忔湰娈电涓€鍙ユ彁鍒皉eptiles銆傜敱姝ゆ垜鍊戞帹鏂蜂笂涓€娈电祼(ji茅)灏捐檿璜囩殑鍏�(n猫i)瀹瑰繀瀹氳垏reptiles鏈夐棞(gu膩n)銆傞€欑偤鍥炵瓟绗�45椤屾彁渚涗簡涓昏绶氱储銆傚彟澶�锛屾渶鍚庝竴娈电涓€鍙ユ彁鍒颁簡骞翠唬锛岃€岄伕鎿囬爡(xi脿ng)C涓彁鍒颁簡骞惧€�(g猫)骞翠唬锛岃鏄庨€欓噷鍦ㄦ寜姝峰彶鏅�(sh铆)搴忔晿杩板嫊(d貌ng)鐗╃殑閫�(j矛n)鍖栭亷绋嬨€�

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