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  3. The invention of irrigation is meaningful because it could help to Which of following tends to warm the climate?

The invention of irrigation is meaningful because it could help to Which of following tends to warm the climate?

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问题 The invention of irrigation is meaningful because it could help to
Which of following tends to warm the climate?
选项 A、To develop the irrigation system.
B、To promote organic agriculture.
C、To revert to hunting and gathering.
D、To turn farmland back into forest.
答案B
解析 本题问下面哪一项使大气变暖?文章末段说人类在发展农业的过程中毁林开荒，通过燃烧把二氧化碳排放到空气中，导致空气中的二氧化碳升高；种植水稻也产生了大量甲烷(含碳)。这两种因素导致大气中含碳气体的增加，升高气温，故"有机农业的发展"正确。这里"organic agriculture"指的是不用化肥或杀虫剂，而用动物或植物肥料的农业。而文中的毁林开荒以及种植水稻都是古代农业，显然属于"organic agriculture"。发展水利系统：取材于文章第一段，和气候变暖没有直接关系。转向打猎和采摘；退耕还林：这些都可降低温室气体的产生，与题意相反。
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考研英语一

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