题目

A mother who worked as a dinner lady at a primary school to make ends meet is celebrating after being admitted as a headmistress. Rosalind Brotherton took a job serving_________to children following the breakdown of her marriage, but just nine years later she is_________a school of her own.While_________as a dinner lady at Swan Lane First School, she also studied for an Open University_________in History. After graduating in 2005, Ms Brotherton studied_________her teaching qualification before joining a_________as a trainee teacher. She moved to another school where she_________the headmistres5．下列初中化学常见的几种物质相互转化关系图，其中B为黑色固体，N为蓝色沉淀，其中部分生成物和反应条件已略去．请回答：（1）D的化学式为CaO．（2）B→A的化学方程式为CuO+CO$\frac{\underline{\;\;△\;\;}}{\;}$Cu+CO2．（ 3 ）C和F反应的化学方程式为CuSO4+2NaOH=Cu（OH）2↓+Na2SO4，其基本反应类型为复分解反应．