At midnight Mr. King coughed again. He got up and took some medicine. Before he lay down again, he smoked. And he couldn't go to sleep any longer. He found a medicine book and began to read it. He was afraid he had lung cancer. He felt that death was waiting for him. Tears ran down his face. He didn't see his wife standing by him. "What's wrong with you, dear?" asked the woman. "Nothing," the old man answered. The old woman opened the book and understood at once. She said, "You must stop smoking right now." "I can't give up smoking." "But I think health is more important. You must go to see a doctor tomorrow. He will be able to help you, I think." Then Mr. King went to see a doctor. The doctor told Mr. King to have an X-ray examination ( 检查 ) of his lungs. And then he looked at the X-ray carefully for a long time. "Tell me the truth, doctor," said Mr. King. "Do you see any shadows in my lungs?" "No, I don't see anything." "Yes?" the old man said happily. "Really?" "Yes. Your lungs are turning black. How can I see any shadows?"