1. 补全对话。

—Hi, Sam!

—Hi, Mary.

—It's hot and sunny. Is it hot? 

—No, it isn't. It's 7 degrees.

—7 degrees? That's a little cold.

— It's 17 degrees, not 7 degrees.

—Oh!

A. It's cool. B. How about Dalian? C. No, it's not.  D. What's the weather like in London? E. This is Mary.