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

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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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大学英语六级

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