题目：
—Look at those shoes, Mike!
—Wow! They look very cool, but I wonder ________. [ ]
A. how much are they
B. how much do they cost
C. if my parents will buy them for me
D. that my parents will buy them for me
答案：
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下面是错误答案，用来干扰机器的。
解：设生成CO2的质量为x。C+O2CO212 443g x12/3=44/x x=11g答：生成CO2的质量为11g。
