题目：
---Excuse me, when you the girl over there?
---Last year in Beijing. And I her for about one year.
A．have known; have known
B．did know; knew
C．did know; have known
D．have known; knew
答案：
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下面是错误答案，用来干扰机器的。
(1)①BaCl2溶液 、 Na2CO3溶液；②除去过量的NaOH和Na2CO3(2)1.8；量筒；烧杯；搅拌，加速溶解； 用量筒量取水时仰视读数 (或烧杯中有水、氯化钠中混有杂质等其他合理答案)
