选择合适的句子补全对话。                                 

A．It is fat.        B．It's a tiger. C． What's that? D．I'm fine, thank you. E. Good morning, Mike.

Mike: Good morning, Wu Binbin.

Wu Binbin:  How are you?

Mike:  

Wu Binbin: What's this?

Mike:  

Wu Binbin: 

Mike: It's a bear.

Wu Binbin: