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托福阅读词汇题：Cetaceans

2015-08-11 15:48:09来源：网络

　　【托福阅读题型：Cetaceans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：Cetaceans

　　【Paragraph 3】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. The　skull is cetacean-like but its jawbones lack the enlarged space that is filled with fat or oil and used for receiving　underwater sound in modern whales. Pakicetus probably detected sound through the ear opening as in land mammals.　The skull also lacks a blowhole, another cetacean adaptation for diving. Other features, however, show experts that　Pakicetus is a transitional form between a group of extinct flesh-eating mammals, the mesonychids, and cetaceans. It　has been suggested that Pakicetus fed on fish in shallow water and was not yet adapted for life in the open ocean. It　probably bred and gave birth on land.(The Origins of Cetaceans)

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

　　○exact

　　○scarce

　　○valuable

　　○initial

　　答案见下一页：

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