填空题

Waterlogged fields and coastal sand storms make people in parts of Guangdong Province introduce the "dam-pond system" to raise fish in the pond and grow vegetables on tops of the dam around the pond.

【参考答案】

N

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填空题

New towns and other non-agricultural uses occupy large amounts of degraded land.

填空题

Farmers can improve agricultural production by using more and more expensive fertilizers to make the degraded land get enough nutrients.