单项选择题

Questions 17—20 are based on the following monologue about yawn. You now have 20 seconds to Read Questions 17—20. According to the speaker, when are hippos likely to yawn

A．When they are swimming.
B．When they are quarreling.
C．When they are socializing.
D．When they are eating.

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单项选择题

单项选择题

Questions 17—20 are based on the following monologue about yawn. You now have 20 seconds to Read Questions 17—20. According to the speaker, when are hippos likely to yawn 您的浏览器不支持 audio 元素。