阅读短文,判断正误。
A: Good morning, class.
B: Good morning, Miss Li.
A: Sit down, please. Open your books, please.
B: Yes, Miss Li.
A: Where's your book, Su Hai?
C: Er …
A: Is it in your schoolbag?
C: No, it isn't.
A: Is it in Su Yang's schoolbag?
C: Oh, yes!