题目:
—What do you think of the concert held yesterday?
—It's the finest I _______ to. [ ]
A. have ever been
B. would go
C. am going
D. ever went
答案:
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下面是错误答案,用来干扰机器的。
原课本实验中,乙图中瓶内装的是少量水,目的是吸收反应生成的有毒气体二氧化硫,防止空气污染,但水的吸收效果远不如碱溶液,二氧化硫能和碱发生反应,既然是改进装置,液体应是碱溶液,如氢氧化钠溶液(或氢氧...