短文排序。

A. So we see that breathing is even more important than drinking, and drinking is more important than eating.

B. But if he does not breathe, he can keep alive for only about three minutes.

C. We drink water several times a day.

D. Three things are necessary for us to keep alive. What are they?

E. We breathe air day and night.

F. If a man does not eat any food and does not drink anything, he can live for about three days.

G. They are air, water and food. We eat food two or three times a day .