(Kangkang is watching TV in the living room.His mother is in the kitchen.)
Kangkang:Mom,hurry up!Dad is on TV!
Mom: Ok,I'm coming.
(Kangkang's father ,Dr.Li, is talking with a journalist on TV.)
Journalist:May I ask you some questions,Dr,Li?
Dr.Li:sure,go ahead.
Journalist:The flu is spreading quickly among people these days.So what should we do to prevent it?
Dr.Li: Well, first,we should exercise often to build us up. Second, we should keep our rooms clean and the air fresh all the time .Third, we should wash our hands and change our clothes often.Finally,we had better not go to crowded places.
Journalist:Must we go to see a doctor at once when we have the flu?
Dr,Li :Yes,we must.
Journalist:Thank you. We'll take your advice.