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

試題分析：此題考查對語句的正確理解，及對化學(xué)的相關(guān)知識的把握，根據(jù)語境可知此題選擇B。水的分子式是H2O.
點(diǎn)評：此題涉及到學(xué)科之間的相互關(guān)聯(lián)。對于水的構(gòu)成和化學(xué)分子式及元素符號要記清。還要理解此句的基本含義
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