题目

若正数a是一元二次方程x2－5x＋m＝0的一个根，－a是一元二次方程x2＋5x－m＝0的一个根，则a的值是________． 答案：5.完型填空（共20小题；每小题1.5分，满分30分）About two years ago while working downtown at our company’s headquarters I met a man. I’ll call him “Martin”. Martin was a short, middle-aged man with a glandular(内分泌) problem. He was fat, using a walking stick to help, and was painfully shy. Almost every morning I saw Martin on the elevator. We were usually the only people there, so I made __36   conversation as we __37_ to the 15th floor. I chatted with him about sometimes weather and sometimes about each other’s weekend.About six months __38   our daily elevator chats, Martin came to my office and asked if I had a minute to chat. Though we worked on the same floor, I’m sure he had to __39   to find me. I invited him to sit down. He said, “I wanted to come and say __40  . The company has let me go. Today will be my last day.”I didn’t know what to say. __41   I was too familiar with saying goodbye to co-workers, it was never __42  . Honestly, I usually avoid talking about the event because I felt __43   and at a loss for words. I told him I was __44   and asked if there was anything I could do. He said, “No, I’ll be fine, I just wanted to take the time to thank you.” I was now __45   . He explained that our daily talks had __46   a lot to him.He thanked me not only for  __47   with him in the mornings, but for speaking directly to him and others on the elevator, and for telling him a quick joke in the crowded cafeteria. It seemed that __48   had ever been his friend before—or if so they were __49   to him in public.He said he didn’t want to __50   much of my time, as he knew I was busy and he needed to __51   his personal things. He had tears in his eyes as he shook my hand and left.I’ve never seen him since, but I imagine he’s doing well. Meeting him  __52   my life. Now when I’m in a hurry, or have a bad day, I try extra hard to speak __53   to those around me. I remind myself that it’s just as easy to say something nice as to say something __54  , and I’m awed (敬畏) at how __55   our daily actions are.36. A. formal          B. polite        C. special          D. usual37. A. climbed                 B. ran              C. rode             D. moved38. A. during                B. before          C. until             D. after39. A. search                 B. walk            C. drive            D. move40. A. thanks                B. goodbye       C. hello             D. words41. A. But                    B. Because        C. When           D. Though42. A. difficult                     B. easy            C. convenient    D. comfortable43. A. astonished           B. painful       C. embarrassed   D. amazed44. A. calm                   B. nervous        C. disappointed  D. sorry45. A. confused        B. worried        C. moved          D. proud46. A. meant                 B. done            C. caused          D. brought47. A. working              B. traveling      C. chatting               D. staying48. A. someone             B. everyone      C. anyone          D. no one49. A. cold                   B. friendly        C. warm            D. cruel50. A. use up                B. take up         C. break up       D. pick up51. A. sell                     B. decorate      C. pack             D. sort52. A. changed                     B. colored        C. satisfied               D. controlled53. A. directly               B. loudly          C. kindly           D. softly54. A. different             B. rude         C. serious       D. interesting55. A. surprising           B. strange         C. impressive    D. powerful