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。