In the doctor’s waiting room, sick people are waiting on their chairs. Bob, a school boy, is among them. They all look very sad except(除了)Bob. He is enjoying an exciting story in a magazine. Just then the doctor comes in to say he is ready for the next person. Bob jumps up and runs into the doctor’s room. “What’s your trouble?” says the doctor. Before Bob could say a word, the doctor makes him lie down on a bed, “Now, let me listen to your heart.” Bob tries to speak, but the doctor tells him not to say anything. “I’ll take your temperature.” Bob tries to sit up, but the doctor stops him. After a moment, the doctor says, “Well, boy, you don’t have a fever. In fact, there’s nothing wrong with you.” “I know there isn’t,” says Bob. “I just come here to get some medicine for my father.”