题目内容：

On a small farm in Mexico, there are no schools. A bus is the school! The driver of the bus is the teacher! It is a school bus, but it doesn't take children to school. It just goes round from place to place, and sometimes it comes to this farm. The bus will stay here for three months. The farmers call it a school on wheels (车轮).

Every time the bus comes, the farmers come running to it, shouting and laughing. They warmly welcome the school bus!

When the bus is on the farm, in the morning, the teacher teaches the small children. In the afternoon, the bigger children come to have their lessons because they must work in the morning. At night, the fathers and mothers come to school. They want to learn, too. How the farmers hope that some day they can have a real school on their farm!

1.The driver of the bus is ________.

A. the teacher        B. the student      C. the farmer     D. the school

2. The bus school will ________.

A. take children to school                    B. stay there for lunch

C. go round from place to place               D. take the fathers and mothers to school

3. When the school bus comes, the farmers________.

A. stop working    B. warmly welcome it    C. be happy    D. Both B and C

4.Which one of the following is true?

A. A school bus is a real school for farmers' children.

B. The bus school has no teacher at all. 

C. The bus school has no students.

D. The children and their parents on the farm all come to the bus school to learn.