水土流失是形成黄土高原千沟万壑自然景观的主要原因，每年流失的

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水土流失是形成黄土高原千沟万壑自然景观的主要原因，每年流失的土壤约16亿吨，据此回答下列小题：
保持水土的根本措施是（）

A．平整土地	B．修水平梯田
C．深耕改土	D．造林种草

黄土高原地区可持续发展的基础是（）

A．经济可持续发展	B．社会经济持续发展
C．生态可持续发展	D．减少污水排放量

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