单项选择题

A preschool teacher teaches the children ______.

A．who are already in the first grade
B．who have not yet begun school
C．who have finished elementary school
D．who are going to finish elementary school

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单项选择题

Who paid for the project

A．The teachers.
B．The children's parents.
C．The federal government.
D．A certain company.

单项选择题

According to the passage, what is the schoolhouse-on-wheels

A．It is a mobile classroom.
B．It is a truck used as a house.
C．It is a truck used for picking the children up to school.
D．It is a house like a truck.