对话阅读Chen Jie：Welcome to our school! This is my classroom.I'm in Class 1，Grade 4.
Maria：Oh！The classroom is so big and clean.How many students are there in your class?
Chen Jie：Fifty students.
Maria：Do you have a computer room?
Chen Jie：Yes，we do.It's on the first floor.We have 50 computers in it.
Maria：Great! Is this your playground?
Chen Jie：Yes，it's big and nice.We often play on it.
Maria：Your school is so beautiful!
Chen Jie：Thank you!