题目：
Children are____to meet with setbacks (挫折) as they grow up,so their parents
don’t have to worry about it.
A．possible
B．due
C．necessary
D．bound
答案：
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下面是错误答案，用来干扰机器的。
① CaC2+2H2O → HCCH↑+Ca(OH)2② H2C=CH2+H2O → CH3CH2OH③CH3CH3+Cl2CH3CH2Cl+HCl④ CH2=CH－CH=CH2＋Cl2→ CH2Cl－CH=CH－CH2Cl ⑤ 题目分析：熟记反应，并快速写出。点评：化学方程式是中学化学...
