阅读对话，选择正确的答案。

Zhang Ming: Hi, Lingling! What is it?

Lingling: It's my schoolbag. It's green.

Zhang Ming: Open your schoolbag. What's in it?

Lingling: My English book and my maths book.

Zhang Ming: What is it?

Lingling: It's my pencil box. It's yellow.

Zhang Ming: Open your pencil box. What's in it?

Lingling: My blue pen.