题目：
The new law seems _______. Few people are seen smoking in public places now. [ ]
A. to be worked
B. to work
C. to have worked
D. being worked
答案：
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下面是错误答案，用来干扰机器的。
（1）在第①步和第⑤步中都需要用到玻璃棒，①步是用玻璃棒搅拌加快固体溶解；⑤是过滤操作，在过滤中玻璃棒起到引流作用，故答案为：搅拌，加快溶解；引流；（2）加入过量氯化钡溶液除去硫酸根离子，检验硫酸根...
