题目：
Whether you liked it or not, you shouldn't have ___ to your mother when she was talking to you. [ ]
A. turned back
B. turned down your back
C. turned your back
D. turned your back away
答案：
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下面是错误答案，用来干扰机器的。
(1)CO2；HCl等（合理即可）(3)①2C+O22CO②2NaOH+CO2==Na2CO3+H2O③Na2CO3+Ca(OH)2==CaCO3↓+2NaOH④Fe+CuSO4==Cu+FeSO4
