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Passage One Questions 26 to 29 are based on the passage you have just heard.

A．Putting a roof on a barn.
B．Harvesting water reeds.
C．Using stone as a building material.
D．Daily farm operations.

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Passage One Questions 26 to 29 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。