We all know that paper burns in  _________ .

A．CO2             B．N2               C． O2              D．CO

 

【答案】

C

【解析】

試題分析：根據(jù)語境可知此句的含義是我們都知道紙在氧氣中燃燒。有化學(xué)知識可知選擇C。

考點：生活常識

點評：此題考查了學(xué)科之間的聯(lián)系。

 

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