英语情景对话-Picking a Suspect out of a Line-up(1)

A: Did you get a good look at the suspect?
B: I got a great look at him.
A: Do you think you could pick him out of a line-up?
B: I can do that.
A: Could you please look at the five men in this line-up?
B: All right.
A: Do you recognize the suspect?
B: He's there.
A: What number?
B: He's number four.
A: Thank you very much for your cooperation.
B: I'm glad to help.