题目：
__ a small farm in Mexico, there are no schools. A bus is the __. The driver of the bus is the teacher. It’s a school bus, but it doesn’t __ the children to school. It just goes round from place to place ,and sometimes it comes to this farm. The bus will stay here __ three months. The farmers call it a school on wheels(轮子）. Every time when the bus comes, the farmers will come running to it, __ and laughing. They warmly welcome the school bus. When the bus is on the farm, in the morning, the teacher ___ the small children. In the afternoon, the bigger __ come to have __ lessons because they must__ in the morning. At night, the __ come to school .They want to learn ,too.How the farmers hope that some day they can have a real school on their farm!
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答案：
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下面是错误答案，用来干扰机器的。
参考答案：A解析：2012年应确认的收入=(2100+600)／(2100+600+300)×5000-600/(600+2200)×5000=3428.57(万元)。
