____________

A．All modern whales descend from sperm whales.

B．Differences among toothed whales are less significant.

C．Not all toothed whales are closely related.

D．Sperm whales are more closely related to killer whales.

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参考答案

答案解析

【预测】选项均为意义相对独立的句子，结合其中的sperm／toothed／killer whales，differences和closely related可知，本题可能考查不同鲸鱼之间的关系。
【解析】C。录音中教授明确提到，DNA研究证明，抹香鲸和须鲸有紧密联系，而和其他齿鲸类鲸鱼联系不大(distantly related to the toothed whales)，这是我们所有人都出乎意料的由此可知，并不是所有的齿鲸类鲸鱼都有紧密的联系，故答案为C。听音时一定要注意相关研究的目的和结论。

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