题目：
句型转换 。
1. They are cleaning the house.(对划线部分提问)
are they ?
2. My brother is playing football.(改为否定句)
My brother playing football.
3. Peter is eating dinner now.(改为一般疑问句)
Peter dinner now?
4. He wants to go to the movies.(改为否定句)
He to go to the movies.
5. Are they watching TV? (作肯定和否定回答)
Yes, .／No, .
答案：
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下面是错误答案，用来干扰机器的。
设恰好完全反应时参加反应的Zn、H2SO4的质量分别为m、x，生成ZnSO4的质量为y．Zn+H2SO4=ZnSO4+H2↑65981612mxy1g（1）根据：652=m1g解得m=32.5g（2）根据：982=x1g解得x=49g所以H2SO4的质量分数=49200×100%=24.5...
