完形填空。 Norman Cousins was a businessman from the United States who often traveled around the world on business. He enjoyed his 1 and traveling. Then, after returning to the United States from a 2 trip to the Union of Soviet Socialist Republic (USSR), Mr. Cousins got sick. Because he had pushed his body to 3 of its strength on the trip, a change began to take place 4 him. The material between his bones became 5 . In less than one week after his return, he could not 6 . Every move that he 7 was painful. He was not able to sleep at night. The doctors told him that they did not know how to cure Mr. Cousins' problem and he might never 8 over the illness. Mr. Cousins, however, refused to give up 9 . Mr. cousins thought that 10 thoughts were causing bad chemical changes in his body. He did not want to take medicine to cure himself. 11 , he felt that happy thoughts or 12 might cure his illness. He began to 13 on himself while still in the hospital by watching funny shows on television. Mr. Cousins quickly found that 10 minutes real laughter during the 14 gave him two hours of pain-free sleep at night. 15 the doctors could not help him, Mr. Cousins left the hospital and checked into a hotel room where he could 1 his experiments with laughter. For eight days, Mr. Cousins tested in the hotel room watching funny shows on television, reading funny books, and sleeping 17 he felt tired. Within three weeks, he felt well 18 to take a vacation to Puerto Rico where he began running on the beach for 19 . After a few months, Mr. Cousins returned to work. He had laughed himself back to 20 . (     )1. A. time (     )2. A. boring (     )3. A. top (     )4. A. from (     )5. A. weak (     )6. A. speak (     )7. A. made (     )8. A. look (     )9. A. effort (     )10. A. foolish (     )11. A. Instead (     )12. A. sleep (     )13. A. rescue (     )14. A. day (     )15. A. Promising (     )16. A. invent (     )17. A. until (     )18. A. soon (     )19. A. exercise (     )20. A. power B. holiday B. tiring B. degree B. around B. ill B. breathe B. did B. get B. hope B. unusual B. However B. travel B. operate B. week B. Deciding B. begin B. whenever B. completely B. illness B. sense C. sleep C. dangerous C. problem C. inside C. false C. stand C. took C. turn C. treatment C. funny C. Therefore C. laughter C. examine C. month C. Doubting C. continue C. unless C. slowly C. rest C. health D. work D. pleasant D. limit D. beside D. painful D. see D. gave D. think D. arrangement D. unhappy D. Otherwise D. television D. experiment D. year D. Recognizing D. prove D. so that D. enough D. pleasure D. happiness