1. 根据图片提示，选择相应的句子补全对话。

A. What's that?   B. It's a door.   C. It's a yellow ball.     D. What's this?

1. （1）

   —

   —It's a panda.

3. （2）           

   —What's that?

   —

5. （3）

   —

   —It's a bird.

7. （4）

   —What's this?

   —