单项选择题

Questions 22 to 25 are based on the passage you have just heard.

A．When the season changes.
B．When the color of the food changes.
C．When they move to different places.
D．When they are attracted by different smells.

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单项选择题

Questions 22 to 25 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。