(单选题)

Which of the following statements is true?

A.Dolphins eat almost anything that they come across.

B.The teeth of the oldest whales are much larger than their jaws.

C.The oldest whales are also the ancestors of dolphins.

D.Baleen whales have fairly big teeth.

参考答案：C

参考解析：

推理判断题。根据文章第二段可知，我们所知道的最古老的鲸鱼，这些不仅是蓝鲸和座头鲸等大型鲸鱼的祖先，而且是今天海洋中所有海豚的祖先，它们的牙齿相当大，所以C项是正确的。A项中的Dolphins应该改成The old whales；根据第三段最后一句“relative to the size of their jaws, were relatively large, so they were really predators”可知，最古老的鲸鱼的牙齿比下巴相对大一些，B项中的much larger属于夸大事实，故排除；根据第三段可知，They有很大的牙齿，其中They指代的是The old whales，而不是D项中的Baleen whales，故排除。故选C。

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