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Questions 17—20 are based on the following monologue about yawn. You now have 20 seconds to Read Questions 17—20. What’s the main topic of the monologue

A．Different animals’ yawn.
B．Human’s yawn.
C．Fish’s yawn.
D．Social animals’ yawn.

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Questions 17—20 are based on the following monologue about yawn. You now have 20 seconds to Read Questions 17—20. What’s the main topic of the monologue 您的浏览器不支持 audio 元素。