题目内容

If H2 burn in O2, we can get _____.
A．H2B．H2OC．O2D．H2O2
B

试题分析：此题考查对语句的正确理解，及对化学的相关知识的把握，根据语境可知此题选择B。水的分子式是H2O.
点评：此题涉及到学科之间的相互关联。对于水的构成和化学分子式及元素符号要记清。还要理解此句的基本含义
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