问题
选择题
| 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
答案：A
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| 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：A