单选题：Greenhouse gases are indispensable to mankind, but the probl

题目分类：理工类
题目类型：单选题
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题目内容：

Greenhouse gases are indispensable to mankind, but the problem mankind is faced with is ___________. A．one of the major contributors
B．the ever-increasing atmospheric concentrations of greenhouse gases
C．big and hefty cows
D．livestock's normal digestion process
E．how to cut down the cattle populations
F．big industries and gas-guzzling vehicles

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