______the climate affects the future sustainable agricultural development? ______pollution can be controlled by increasing the

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问题 ______the climate affects the future sustainable agricultural development?
______pollution can be controlled by increasing the production cost of polluting goods?

选项 A、 
B、 
C、 
D、 

答案D

解析 阅读文章,发现BOOK 4中第三段第一句指出:pollution is controlled by increasing...,与题句基本一致,只是将the relative price...production process换成了题句中的cost,因此答案是D。
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