阅读理解，选择正确的答案。

Sarah: Hi, John. I have a new schoolbag.

John: Really? May I see it?

Sarah: Look! It's green.

John: Wow, so nice! What's in your schoolbag?

Sarah: Three storybooks, two maths books, five pens, two pencils, two erasers and a pencil box.

John: Wow! It's a heavy schoolbag.

Sarah: Yes. It's so heavy! What's in your schoolbag?

John: A Chinese book, a pen and a notebook.

Sarah: Oh, your schoolbag is so light.