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2015-08-25 12:01:14来源:网络

  THE ORIGINS OF CETACEANS

  第一自然段:It should be obvious that cetaceanswhales, porpoises, and dolphins-are mammals. They breathe through lungs, not through gills, and give birth to live young. …

  第二自然段:Very exciting discoveries have finally__ allowed scientists to reconstruct the most likely origins of cetaceans. …

  第三自然段:The fossil consists of a complete skull of an archaeocyte, an extinct group of ancestors of modern cetaceans. Although limited to a skull, the Pakicetus fossil provides precious details on the origins of cetaceans. …

  第四自然段:Another major discovery was made in Egypt in 1989. Several skeletons of another early whale, Basilosaurus, were found in sediments left by the Tethys Sea and now exposed in the Sahara desert. …

  第五自然段:An even more exciting find was reported in 1994, also from Pakistan. The now extinct whale Ambulocetus natans ("the walking whale that swam") lived in the Tethys Sea 49 million years ago. …

  首先,第一自然段综述关于鲸类动物是哺乳动物的事实,到了第二自然段开始揭示鲸类动物起源的具体细节,说到科学家有一些重要发现,到了第三自然段开始交待第一种化石的名称Pakicetus.第四自然段又提到另外一种化石发现,名字为Basilosaurus,最后一自然段提到第三种化石发现Ambulocetus natans,总结来说,这篇文章通过介绍三个化石来揭示了鲸类的起源.

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