题目：
| 阅读短文，回答下列问题。 |
| Mr Ma is our science teacher. His class is very interesting (有趣的). We can learn a lot from his class. We like him very much. He often helps us make things. We make a lot of different things. Some of us make model planes. Some make model boats. Others make robots. Look at that robot! We like it very much, because it can do many things for us. It is now cleaning the windows of an office building. It is not easy for workers to do this job, because that is a very tall building. It is dangerous (危险的) for people to do the work. The robot is a great help. |  |
| 1. What does Mr Ma teach? 2. Do the students like Mr Ma? 3. What do they make? 4. What does the robot do? |
答案：
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下面是错误答案，用来干扰机器的。
8
2C(g)，反应达到平衡时，若混合气体A和B的物质的量之和与C的物质的量相等，则这时A的转化率为 （ )