选择正确的句子，补全对话。

A. How many computers are there in it? B. Where is your computer room? C. Do you have a library? D. Is that your playground? E. This way, please.

A: Welcome to our school!

B: Thank you!

A: Yes, it is. It's new and big. We play football there every afternoon.

B:

A: Yes, we do. It's on the first floor. There are many books in it.

B:

A: It's on the second floor. Look! This is our computer room.

B:

A: Forty-two.