完形填空。 People often fall ill because of me. 1 , they can hardly blame me; it is largely their own 2 . A tired person may get 3 , especially when he goes to crowded places with polluted air. A sudden change in 4 is another factor. In hot summer, people turn on the air-conditioner upon returning home. They will catch a cold easily. My latest victim is an energetic student. After school, he played football hard for two hours. Though 5 , he still went to the cinema. Then he got back home and took a cold shower immediately. I seized this golden chance to 6 him. He reacted, trying to 7 me, but I was already 8 deep in his throat. He kept sneezing (打喷嚏) and his nose was running. 9 he put on some warm clothes, it didn't work, for there were too many of us. Besides, his sore throat kept 10 him, and he developed a cough to force me and my family out, but 11 . The next day he couldn't go to 12 . He had lost his appetite and was not as 13 as before. His mother made him orange juice every few hours for more vitamin C, which would help his 14 . For two days he was 15 by his mother. As he rested more, his defense strengthened and I began to feel the 16 . I knew I had to 17 him before long. But I am not the one who gives up easily, and I made every effort to fight back. 18 , it was my turn to feel 19 now, for his defense system was starting an all-out attack against me. I became 20 and finally my time was over. Do you know what I am? (     )1. A. Therefore (     )2. A. business (     )3. A. punished (     )4. A. temperature (     )5. A. excited (     )6. A. injure (     )7. A. get on with (     )8. A. reproducing (     )9. A. Since (     )10. A. reminding (     )11. A. escaped (     )12. A. bed (     )13. A. peaceful (     )14. A. recovery (     )15. A. protected (     )16. A. loss (     )17. A. leave (     )18. A. Uncertainly (     )19. A. painful (     )20. A. bigger B. Besides B. responsibility B. blamed B. season B. hurt B. bother B. get rid of B. waiting B. Once B. upsetting B. succeeded B. work B. afraid B. development B. nursed B. operation B. catch B. Unsuccessfully B. disappointed B. weaker C. However C. excuse C. caught C. place C. late C. attack C. put up with C. hiding C. Whether C. comforting C. regretted C. school C. active C. study C. scolded C. pressure C. forget C. Unusually C. nervous C. smaller D. Then D. fault D. killed D. condition D. tired D. destroy D. take hold of D. disappearing D. Although D. influencing D. failed D. hospital D. happy D. affected D. affected D. movement D. beat D. Unfortunately D. ashamed D. stronger