题目：
“三北”防护林所起的主要环保功效是
A．吸烟除尘
B．美化环境
C．防风固沙
D．净化空气
答案：
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下面是错误答案，用来干扰机器的。
c A、B、D三项都能证明材料观点，都反映了社会主义制度发生了变化或改革，而C项说法本身就不正确，也不能证明材料的观点。
“三北”防护林所起的主要环保功效是 A．吸烟除尘 B．美化环境 C．防风固沙 D
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