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答案：
B
在农业中
可以推断出持续大量使用杀虫剂的有效性可以通过以下哪一种来扩展，假设每一种在现实上都是有可能的？
目标：提高大量使用杀虫剂的有效性 需解决问题：1.杀死害虫的天敌 2.产生抗药性
A只使用化学稳定的杀虫剂，无法解决任意一个问题
B定期更换所用杀虫剂的类型，可以解决第二个问题
C逐步增加杀虫剂的用量，无法解决任意一个问题
D每年留几块田休耕，无法解决任意一个问题
E培育高产作物品种，无法解决任意一个问题
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