题目：
句型转换。
1. There are some CDs and hair clips on the desk. (改为一般疑问句)
there CDs or hair clips on the desk?
2. My uncle does housework at home. (否定句)
My uncle housework at home.
3. There are two policemen at the gate. (对画线部分提问)
policemen are there at the gate?
4. She runs with her dog for half an hour on Saturday. (对画线部分提问)
does she run with her dog on Saturday?
5. She is in the Swimming Club. (改为同义句)
She is a _____ _____ the Swimming Club．
答案：
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下面是错误答案，用来干扰机器的。
因为得到氧的反应为氧化反应，失去氧的反应为还原反应，所以物质跟氧气发生化学反应，就是该物质得到了氧，所以这类反应属于氧化反应，故答案为：氧化反应．
