TPO 2 THE ORIGINS OF CETACEANS - 英檢

※ 引述《vul3sm3c96 (小女孩)》之銘言：
: 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.
: 題目是
: Pakicetus and modern cetaceans have similar
: (B) adaptations of diving
: (C) skull shapes
: 答案是C但我寫B
: 我知道C是對的但是第七行的another cetacean adaptation for diving又
: 要怎麼解釋呢??
: 謝謝大家
: 最近有點被托福弄的瘋瘋癲癲啊@@

文:"The skull also lacks a blowhole, another cetacean adaptation for diving."
意為Pakicetus缺少blowhole,而blowhole卻是cetacean為了適應diving而發展出的特性,
所以簡單說：Pakicetus沒有(lacks)blowholeㄝ,
cetacean卻有,故（B）錯。

（以上內容由美加黃冠文教授 提供）


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