阅读对话，选择正确答案。

 Liu Tao : Hi, Su Hai. Is this your crayon?

Su Hai: No. This crayon is green. It's Yang Ling's. M y crayon is red.

 Liu Tao: Yang Ling, is this your crayon?

 Yang Ling: Yes, it is. Thank you. What's this?

 Liu Tao: It's a pen. It's my birthday present. (生日礼物).

Yang Ling: How nice! Is the new pencil case your present, too?

 Liu Tao: No, it isn't. . It's Su Yang's.