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

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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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