题目

Alfred Alder,  a famous psychiatrist,  had  __1__   interesting experience. When he was a small boy he got off to a poor start in arithmetic  (算术).  His teacher got the idea that he had no ability in arithmetic, and told his parents  __2__ she thought in order that they would not expect too much of him. In this way, they also developed the idea,  “Isn't  __3__  too bad that Alfred can't do arithmetic？” He accepted their mistaken estimate of his ability,   __4__   (feel)  that it was useless to try,  and that he was very poor at arithmetic, just as they expec依据下图中各物质间的转化关系，写出①～④中各步反应的化学方程式，并按要求填空． ①________________；②________________； ③________________；④________________． 上述反应中，属于复分解反应的是________(填序号)．