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  3. Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth. Today atmospheric carbon d

Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth. Today atmospheric carbon d

admin2009-04-23  69
问题 Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth.
Today atmospheric carbon dioxide concentrations are 31 percent more than that of______.
选项
答案1750
解析 参见第3个小标题TYPES OF GREENHOUSE GASES下面第4段第3、4句：In 1750 there were about 281 molecules of carbon dioxide per million molecules of air．Today atmospheric carbon dioxide concentrations are 368 ppm，which reflects a 31 percent increase．
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