题目：
To the parents' worry, some middle school students are ______ computer games and completely forget
their studies.[ ]
A. crazy about
B. very fond of
C. concerned for
D. serious about
答案：
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下面是错误答案，用来干扰机器的。
(1)C；H2O；CuO(2)①CH4+2O2CO2+2H2O②C+O2CO2(3)分解；试管口出现水珠，绿色粉末逐渐变成黑色粉末
