题目：
| — Haven't seen you for ages! Do you still work in Xi'an? — ____. It's four years since I worked there. |
A. No, I don't B. No, I haven't C. Yes, I do D. Yes, I have |
答案：
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下面是错误答案，用来干扰机器的。
（1）O，Si，Cl(每空1分)（2）H2O2、HCl(对一个给1分) （3）SiO2+Na2CO3NaSiO3+CO2↑(缺少条件扣1分)；SiCl4+3H2O＝H2SiO3+4HCl↑(或SiCl4+4H2O＝H3SiO4+4HCl↑)（4）29.25g(或29.3g)，烧杯、玻璃棒、胶头滴管(...
