题目:
—Did you spend a lot of time looking for the missing child?
—________. It took us a long time, but luckily we found him.
A.My pleasure
B.Absolutely
C.Not at all
D.Don’t mention it
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:A、区分蒸馏水、食盐水,方案一:加硝酸银溶液,氯化钠能与它反应,生成白色沉淀,可以区分,方案二:蒸干,若有白色晶体出现,即为蒸馏水,B、区分二氧化碳、空气,方案一:加水,无现象,无法...