【单选题】

Once an old man went to see a doctor. The doctor looked him over carefully and said, "Medicine won’t help you. You must have a good rest. Go to bed early, drink milk, walk a lot and smoke one cigar a day. Go to the country place for a month."

After a month the man came to the doctor again, "How are you " said the doctor, "I’m glad to see you again. You look much younger." "Oh!Doctor, I feel quite well now," said the man, "l had a good rest. I went to bed early, drank much milk and walked a lot. Your advice really helped me, but you told me to smoke one cigar a day almost killed me first. It’s no joke to start smoking at my age!\
From the passage we know______.A．the old man once smoked more than one cigar a day
B．the old man once smoked one cigar a day
C．the old man didn’t smoke before he went to see the doctor