题目内容：
根据听到的内容，回答 17～20 题
What's the main topic of the monologue?
[ A ] Different animals' yawns.
[ B ] Human's yawn.
[ C ] Fish's yawn.
[ D ] Social animals' yawns.
参考答案：
答案解析：
单选题：根据听到的内容，回答 17～20 题What's the main topic of the monologue?[ A
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根据听到的内容，回答 17～20 题
What's the main topic of the monologue?
[ A ] Different animals' yawns.
[ B ] Human's yawn.
[ C ] Fish's yawn.
[ D ] Social animals' yawns.