阅读理解。 What do you usually do after class? When class is over, most students in my class I go out to relax. We have a twenty-minute break (休息) between classes. Look! Some students are in the playground. They are having a basketball match .A boy is running with a ball and another is trying to stop him. They are so cool. Some girls are watching the match. Some students are in the classroom. They are talking with each other. A few of them are reading English and doing their homework. A girl is looking at the birds in a tree outside the classroom. She must be thinking of something interesting because she looks very happy. What are the teachers doing now? In the office, some of them are preparing for the next class, and some are talking with their students. Everyone is busy with his or her things. They are all good teachers. 1. The passage is mainly about ________. A. students B. teachers C. a basketball match D. the break time between classes 2. How long (多久) can students have a break between classes according  to the passage? A. Twenty minutes. B. Ten minutes. C. Twelve minutes. D. Fifteen minutes. 3. You can't see the students ________. A. in the classroom B. in the office C. in the playground D. in the library 4. The teachers are ________ in the office. A. working or talking with their students B. having a basketball match C. reading newspapers D. playing with their students 5. Which of the following is TRUE about the passage? A. The students in the playground are all boys. B. There is only one bird in the tree outside the classroom. C. You can't see any students in the classroom. D. The teachers are all very busy.