阅读下面短文，然后从每题所给的A、B、C、D四个选项中选出最佳选项。

There are some letters（字母） on the blackboard. It's letter P. It's green. What's this and what colour is it? It's letter E and it's yellow. What's this letter? It is letter N. It's red. P- E- N. Is it "pen"? Yes, it is. I have a blue pen in my pencil case. My pencil case is orange. This is my book and it's my English book. It is in my bag. My bag is black. Look! The bag is on the chair. The chair is brown. It's my chair and it's nice. I like it very much.