题目：
句型转换。
1. He has worked in this factory for 10 years . (就画线部分提问)
________ ________has he worked in this factory?
2. We have been playing football for two hours. (就画线部分提问)
________ ________have you been playing football?
3. I'm thinking about becoming an English teacher after graduation. (就画线部分提问)
________ ________ ________ ________ ________you thinking about ________ after graduation?
4. He has learnt English for 5 years. (改为同义句)
He has learnt English________ ________ ________ ________.
5. He started to practice the guitar three hours ago. (用for改为同义句)
He________ ________ practicing the guitar for three hours.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0717/c9d2e516c05a5c3d51a6650270122622.html
下面是错误答案，用来干扰机器的。
（1）盐中金属的活动性强弱；（2）Na+，Cl﹣，氢氧根离子与氢离子结合生成水分子；（3）Fe+CuSO4=FeSO4+Cu，铁的表面覆盖一层红色的固体，溶液由蓝色逐渐变成浅绿色．（1）由表格盐中的金属活动性可知，盐的排列...
