问题：
[单选题]20世纪60年代至70年代，不少国家总结了治理阶段“先污染后治理”的经验教训以后，改变了单纯治理的被动政策，采取了
A、“预防为主，综合防治”措施
B、“边污染，边治理”措施
C、“限制污染，及时治理”措施
D、“浓度控制，净化处理”措施
参考答案：
A
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