根据短文内容，选择正确答案。
Many children act in TV shows. They work several hours every day, so they cannot go to regular school. How do they get their education?
In Hollywood many TV shows are made. About forty teachers give lessons for the children in the shows. They teach wherever their pupils are working. The teachers' job is very important. They are responsible for making sure that the children work only the permitted hours each week. They are also responsible for making sure that the children learn the required subjects. They make sure, too, that the children get enough rest and play, along with their education.
Child actors are required to attend classes twenty hours each week. California law says they must be taught from September to June. If they do not make much progress in school, they are not permitted to continue working in TV shows. TV children are usually good pupils, and most of their teachers like this special kind of work. Their classes are held in some wonderful places. Sometimes the “classroom” is a Mississippi riverboat. Sometimes it is the inside of a spaceship. Often the pupils become famous stars.
