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  3. Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth. The most abundant greenhou

Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth. The most abundant greenhou

admin2009-04-23  45
问题 Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth.
The most abundant greenhouse gases are ______and______.
选项
答案water vapor, Carbon dioxide
解析 参见第3个小标题TYPES OF GREENHOUSE GASES下面第1、2段：By far the most abundant greenhouse gas is water vapor，Carbon dioxide is the next most abundant greenhouse gas．
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