正确答案: A

relief

题目：25_________

解析：A

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举一反三的答案和解析：

[单选题]云南某地梯田规模巨大，级数最多的达5000级，现已成为中外闻名的观光景点。当初修建梯田的主要目的是

保持水土

[单选题]EAll too often , a choice that seems sustainable（可持续的）turns out on closer examination to be problematic. Probably the best example is the rush to produce ethanol（乙醇）for fuel from corn . Corn is a renewable resource —you can harvest it and grow more, almost limitlessly . So replacing gas with corn ethanol seems like a great idea .

The greater need for farmland.

[单选题]What can we infer from the underlineed sentence in Paragraph 3?

The world around us could serve as a sound of wonder.