阅读短文，判断正误。（正确“T”，错误“F”）

     Three things are necessary for us to keep alive (活的). They are air, water and food. We eat food two

or three times every day. We breathe (呼吸) air continually (不断地) day and night. If a man does not eat

any food, he can live for about three weeks; if he is stopped from drinking, he can keep alive for about three

days, but if he doesn't breathe, he can keep alive for only about three minutes. So we see that breathing is

more important than drinking, and drinking is more important than eating.

( )1. We can't live without air, water and food.                                                 

( )2. A man can keep alive for about twenty-one days if he has water to drink and air to breathe. 

( )3. He can live for about three days if he only drinks water.                                  

( )4. If he is stopped from breathing, He'll die in a moment.                                    

( )5. Food is the least important of the three.