(留学360新托福阅读句子简化题解析.docxVIP

　本类题目考察对于句子主线的理解能力　Paragraph 5: 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. It lived around 3 million years after Pakicetus but 9 million before Basilosaurus. The fossil luckily includes a good portion of the hind legs. The legs were strong and ended in long feet very much like those of a modern pinniped. The legs were certainly functional both on land and at sea. The whale retained a tail and lacked a fluke, the major means of locomotion in modern cetaceans. The structure of the backbone shows, however, that Ambulocetus swam like modern whales by moving the rear portion of its body up and down, even though a fluke was missing. The large hind legs were used for propulsion in water. On land, where it probably bred and gave birth, AmbuIocetus may have moved around very much like a modern sea lion. It was undoubtedly a whale that linked life on land with life at sea　1. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage?　Incorrect choices change the meaning in important ways or leave out essential information.　○Even though Ambulocetus swam by moving its body up and down, it did not have a backbone.　○The backbone of Ambulocetus, which allowed it to swim, provides evidence of its missing fluke.　○Although Ambulocetus had no fluke, its backbone structure shows that it swam like modern whales.　○By moving the rear parts of their bodies up and down, modern whales swim in a different way from the way Ambulocetus swam.　Paragraph 10: The extreme seriousness of desertification results from the vast areas of land and the tremendous numbers of people affected, as well as from the great difficulty of reversing or even slowing the process. Once the soil has been removed by erosion, only the passage of centuries or millennia will enable new soil to form. In areas where considerable s