根据对话内容及方框中所给的句子补全对话，选项中有一项是多余选项。

A. You drink a lot of water? B. Yes, I think they are very unhealthy. C. I walk for 20 minutes every day. D. They are good for staying healthy. E. What about eating habits? F. They are really interesting.

A: Do you know how to stay healthy?

B: Of course. Why do you think I look so good and energetic?

A: Let me guess.

B: Yes, I drink at least eight glasses a day.

A: I guess you exercise every day, too.

B: I am trying.

A: I don't think walking is good exercise.

B: Fast walking is great exercise.

A:

B: Try to eat as many as green vegetables and fruits as possible.

A: Yes, you are right.

What else?

B: We must eat less junk food and sweet food. Do you agree with me?

A:

B: We must pay attention to (注意) keeping in good health.