题目:
-Laura has been ________ as the secretary from 300 applicants for the job.
-How lucky she is![ ]
A.died out
B.sorted out
C.picked out
D.broken out
答案:
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下面是错误答案,用来干扰机器的。
A、碳酸钾中加入氯化钙会生成碳酸钙沉淀,碳酸钙会溶于硝酸,但是加入氯化钾不会生成沉淀,不满足现象,故A错误;B、碳酸钾中加硝酸钙会生成碳酸钙沉淀,碳酸钙沉淀会溶于硝酸,但是加入硝酸银不会生成白色沉淀,...