单项选择题

Questions 33 to 35 are based on the passage you have just heard.

A．They can prevent soil from being blown away.
B．They can improve the yield of crops.
C．They can provide wood when cut down.
D．They can protect crops from the strong sunshine.

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单项选择题

单项选择题

Questions 33 to 35 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

Questions 33 to 35 are based on the passage you have just heard.