[解析]
W:Hi,David.What would you like to be when you leave school?M:I have no idea.But my cousin is a sailor in the navy.He sent me postcards from the ports where the ship stops.It's exciting.W:Are you going to be a sailor then?M:Well,I don't think it's a good job for me.W:What do you think of my job,teaching?M:It's quite boring.I would prefer to work as a journalist.