题目内容
20.We all know that paper burns in _________.( )A. | CO2 | B. | N2 | C. | O2 | D. | CO |
分析 我们知道纸在氧气中燃烧.
解答 CO2"二氧化碳";N2"氮气";O2"氧气";CO"一氧化碳";根据常识可知,纸应该在氧气中燃烧;故选C.
点评 一方面掌握一定的生活常识,还要明确英文句子的含义,结合语境即可正确作答.
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