题目

句型转换(每题2分,共10分)1. He was born in 1991.(对画线部分提问)  he born?2. I have a big bag. He has a small bag.My bag is________than______.3.There were some pingpong players in our school last year.(改为一般疑问句) therepingpong players in your school last year?4. He is too young to go to school.(改为同义句)He is _______  ________ enough to go to school.5. They are staying there for three weeks.（对划线部分提问）                   are they staying there？某工厂欲从只含有CuSO4的废液中回收金属铜，并得到工业原料硫酸亚铁，其工业流程如下：（1）操作a、b的名称分别是．（2）写出流程中有关反应的化学方程式：、．以上两个反应能够发生的原因是．