A man with a green bag walked into a doctor's room. "Please sit down. Open your mouth and1 your tongue(舌头),"the doctor said, "OK. You can2 your mouth now. It's clear something is3 with you. You have to do more exercise. ""But, doctor," the man said. "I don't think…" "Don't tell me what you 4 ," the doctor said. "I am the doctor, not you. I know5 you need. I see hundreds of people like you. None of them get any exercise. They6 in offices all day and in front of the television in the7 .What you need is to walk quickly for at least 308 a day. " "Doctor, you don't understand," the man said. "I…" "I don't want to hear any9 " the doctor said. "You must find time for exercise. If you don't, you will get10 and have health problems when you are older. " "But I walk every day. " the man said. "Oh, yes, and I know what kind of walking that is. You11 a few meters to the train station from your house, a few more meters from the station to your office, and a few more meters from your office to a12 for lunch and back. " "Please listen to me, doctor!" the man shouted, getting 13 . "I'm a mailman. " the man continued, "I walk for seven hours every day and I come to14 letters. " For a moment, the doctor said nothing, and15 he said slowly, "Put your tongue out again, will you?"
