◎ 题干
CO2 is a major cause of global warming, but the pollution natural gas causes is only 1/800 of _____ caused by burning coal.
A. that
B. it
C. one
D. all
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“CO2 is a major cause of global warming, but the pollution natural gas causes is only 1/800 of _____ causedby burning coal.[ ]A. thatB. it C. one D. all …”主要考查了你对  【指示代词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。