1. 听材料，回答问题。

1. （1） When can American students enjoy free education?

   A . Until 16 years old. B . Until 18 years old. C . Until 20 years old.
3. （2） What makes the progress in high school slow?

   A . That most subjects are difficult. B . That the time for study is too little every day. C . That students of all levels study in the same class.
5. （3） Where do children go if they want to go to universities?

   A . High schools in central cities. B . Suburban high schools. C . High schools opened by universities.