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托福阅读词汇题：The Origins

2015-08-11 15:50:09来源：网络

　　【托福阅读题型：The Origins 词汇题】托福阅读中词汇题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之词汇题

　　托福阅读词汇题：The Origins

　　【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, Ambulocetus 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. (The Origins of Cetaceans)

　　The word “propulsion” in the passage is closest in meaning to

　　○staying afloat

　　○changing direction

　　○decreasing weight

　　○moving forward

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本文关键字: 托福阅读题型 托福阅读训练 词汇题

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