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important. They have a shell posed 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. 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. 該套資料由蕓蕓視頻整理 : 747883097 TL: 028 8194 2202 期待廣大考生咨詢 推薦: 09年新東方考研數(shù)學(xué)英語(yǔ)政治視頻課程 提供試看文件 提供試用下載網(wǎng)盤(pán) 96 [A]The shellfish have a long history in the rock and many different kinds are known. [B]Nevertheless, we k