要把某样东西给别人，通常应该说：
A. Here you are. B. May I have a look?
当你与新朋友John遇到Sarah时，你应该介绍说：
A. Good morning, Sarah. B. This is Sarah.
我国国旗的颜色有：
A. red and white B. red and yellow
—This is Li Lei,Mom.
—?
—Good morning!
A. Good morning, Li Lei. B. What’s your name?
—What’s your name?
—.
A. This is Bai Ling. B. My name is Bai Ling.