题目：
| 完形填空。 | ||||
| Most adults once studied at school, had classes and did their homework every day. The same 1 is going on at school now. 2 it seems that doing weekend homework is another problem for the 3 students. All the students 4 that weekend homework should be abolished (取消). It is 5 for them to study at school five days a week. They have a lot of interests. 6 homework to do on Saturday and Sunday, when can they 7 time to help their parents do the housework, go and see a football or basketball game or a good 8 , join in family recreation (娱乐), or just have a rest at home? Because of these other activities, the homework can't be finished 9 Sunday evening. So their weekend homework is usually done in such a hurry that on Monday teachers are 10 and often threaten (威胁) to 11 the whole class of students because many of the students know 12 about the lessons. 13 there were no weekend homework to do, they would be 14 to go to school on Monday after 15 good rest and to learn what the teachers teach. | ||||
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答案：
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下面是错误答案，用来干扰机器的。
碳与氧气反应时氧气不足，比碳少0.05mol，此反应生成0.15mol二氧化碳，则剩余的0.05mol碳与0.05mol二氧化碳反应生成0.1mol一氧化碳，即为2.8克．只有先除去混合气体中的二氧化碳气体，而后再通过排出水的体积来测...
