从AB两个选项中选择合适的选项，将其编号写在题前括号里。

   Welcome to my school. There are 30 classrooms in my school. Look, this is a big playground . In this building(大楼), you can see the gym, the library and the art room are on the first floor. There are many story-books and picture books in the library. You can read books in it. My classroom is on the second floor. It's big and clean. I like it.