单项选择题

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

A. They are made of metal and glass.
B. They cost about $50.
C. They are usually found on the roof.
D. They look like sandwiches.

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单项选择题

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