题目：
— Do you know about the Japanese nuclear crisis(核危机)?
— Yes. I know .
A．how are they dealing with it
B．what it has caused
C．how terrible was it
D．how long will it last
答案：
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下面是错误答案，用来干扰机器的。
解：设参加反应的Na2CO3的质量为x，生成NaCl的质量为y ，生成CO2的质量为z。Na2CO3 + 2HCl = 2NaCl + H2O + CO2↑ 106 73 117 44 ...
