单项选择题

Questions 19 to 21 are based on the passage you have just heard.

A. Because it is fun.
B. Because they are forced to clean themselves.
C. Because they’re proud of their pretty feathers.
D. Because they have an instinct for cleanliness.

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单项选择题

A. Places the woman has visited.B. A paper the woman is writing for a class.C. School activities they enjoy.D. The man’s plans for the summer.

A. Places the woman has visited.
B. A paper the woman is writing for a class.
C. School activities they enjoy.
D. The man’s plans for the summer.

Questions 19 to 21 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

Questions 19 to 21 are based on the passage you have just heard.