题目

The day before the deadline for this article,I had no clue what I was going to write about. I took my problem to the editor-in-chief, and.he said to me:“Don’t worry; you’re creative. ” I’m not sure where the editor-in-chief reached the conclusion that I was “creative”. Maybe it was through the poems I wrote. Personally, I simply enjoy writing because it’s fun. There’s also the fact that I can’t draw or do anything else creatively, I’m equally sure that there are people in the boat on the other side who can make things look excellent, but can’t write a poem. At this poin下列各项中“操作或现象”能达到预期“实验目的”的是（　　） 选项 实验目的 操作或现象 A 检验碳与浓硫酸反应后的气体产物 将产生的气体依次通过无水CuSO4、澄清石灰水和品红溶液 B 检验溶液中有SO42- 溶液中滴加BaCl2溶液，有白色沉淀生成，再加入HCl沉淀不溶解 C Cl2的氧化性强于I2 向淀粉碘化钾溶液中加入氯水，溶液变蓝色 D 氢氧化铝不溶于碱溶液 向氯化铝溶液中加入过量浓氨水，生成白色沉淀A．AB．BC．CD．D