单项选择题

Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．To forbid grazing on marginal lands.
B．To plant more trees on marginal lands.
C．To establish good ground cover.
D．To graze animals rotationally.

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Passage Two Questions 30 to 32 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。