(单选题)

Marx and his colleague Ewan Fordyce discovered that ______.

A.the fossil of Llanocetus was found is Arctic

B.whale ancestors probably had teeth and baleen at the same

C.Llanocetus looked exactly like modern whales

D.instead of baleen, Llanocetus had sharp teeth

参考答案：D

参考解析：

细节理解题。根据文章第五段第二句和第三句“They analyzed the mouth of a 34-million-year-old fossil of one of the earliest baleen whales, called Llanocetus denticrenatus, found in Antarctica. And they concluded that Llanocetus had sharp teeth and large gums—but no baleen.”可知，他们分析了一块3400万年前的化石，这块化石是在南极洲发现的最早的须鲸之一，名为兰头鲸。他们得出的结论是，蓝鲸有锋利的牙齿和巨大的牙龈，但没有鲸须，因此D项正确。故选D。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语