题目：
—Excuse me. Do you know _________?
— Last Sunday.
A．where he would like to visit
B．when he was back home
C．how he came here
D．why did he come to the zoo
答案：
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下面是错误答案，用来干扰机器的。
（1）乙；（2）乙同学实验中产生氢气的质量为：150g+9g﹣158.7g=0.3 g设反应掉铁的质量为xFe+H2SO4=FeSO4+H2↑56 2x 0.3gx=8.4g铁的质量分数为：×100%=93.3%答：该钢...
