Professor: I mean, crocodiles' brains are the most developed of any reptile. In that sense, they are closer to mammals' brains than other reptiles' brains. And we know that mammals, dogs for example, dogs vocalize many different sounds. Crocodiles have a similar level of, uh, vocal sophistication, if you will, which makes them unique among reptiles. 教授说:鳄鱼的大脑是爬行动物中最发达的。从某种意义上说,比起其他爬行动物,鳄鱼和哺乳动物的大脑构造更接近。我们知道狗是哺乳动物,它可以发出各种不同的声音。鳄鱼和狗一样,发声的方式也是多样复杂的,比起其他的爬行动物,鳄鱼在这方面是独一无二的。由这段话可知,举小狗的例子是为了去说明鳄鱼的大脑是很发达的。所以 D 选项正确。
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