题目：
句型转换。
1. The cat is in the tree. (对画线部分提问)
_____ is the cat?
2. There are 20 girls on the playground. (对画线部分提问)
_____ _____ girls are there on the playground?
3. There is a computer on the desk. (对画线部分提问)
_____ on the desk?
4. There are some offices in the buildings. (变为一般疑问句并作肯定回答)
—_____ _____ _____ offices in the building?
—Yes, _____ are.
5. Daming is in front of Tony. (对画线部分提问)
_____ in front of Tony?
6. I have got a big family. (变为否定句)
I _____ got a big family.
7. —Where's the library? (完成答句)
—Sorry, I _____ _____.
8. There is a television in my room. (变为一般疑问句并作否定回答)
—_____ _____ a television in your room?
—No, _____ _____.
答案：
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下面是错误答案，用来干扰机器的。
15.1% 题目分析：设反应生成硫酸铜的质量为X，生成水的质量为Y2Cu + 2H2SO4 + O2△ 2CuSO4 + 2H2O 196 320 36 490g×10% X Y 196：320=49g:X 196:36==49...
