问题 填空题

台式电脑使用一段时间后,需要打开主机箱除尘,这是因为散热风扇的扇叶在转动过程中与空气摩擦带上了带上了        ,具有                 的性质,所以灰尘会附着在扇叶上。

答案

电荷(电)     吸引轻小物体

题目分析:散热风扇转动的过程中与空气摩擦,使扇叶带上了电,带电体的性质是可以吸引轻小的物体,所以扇叶就把灰尘吸附在表面上了.

点评:知道生活中摩擦起电的现象,知道带电体的性质,并能解释生活中的摩擦起电现象.

完形填空

Directions: For each blank in the following passage there are four words or phrases marked A,B,C and D. Fill in each blank with word or phrases that best fits the context.

“Everything happens for the best,” my mother said whenever I  36 disappointment. “If you can carry on, one day something good will happen. And you'll realize that it wouldn't have happened if not for that  37  disappointment.”

Mother was right, as I discovered after graduating from college in 1932.I had decided to try out a job in radio, then work my way up to sports  38  . I hitchhiked to Chicago and knocked on the door of every station and got turned down every time.

In one studio, a kind lady told me that big stations couldn’t risk hiring inexperienced person. “Go out in the sticks and find a small station that’ll give you a  39 ,”she said.

I thumbed home to Dixon, Illinois.  40  there was no radio-announcing jobs in Dixon, my father said Montgomery Ward had opened a store and wanted a local  41 to manage its sports department. Since Dixon was where I had played high school football, I  42 . The job sounded just right for me. But I wasn’t hired.

My disappointment must have  43 . “Everything happens for the best,” Mom reminded me. Dad offered me the car to job hunt. I tried WOC Radio in Davenport, Iowa. The program director, a wonderful Scotsman named Peter MacArthur, told me they had already hired an announcer.

As I left his office, my frustration  44 . I asked a1oud, “How can a fellow get to be a sport announcer if he can’t get a job in a radio station?”

I was waiting for the elevator when I heard MacArthur   45  . “What was that you said about sports? Do you know anything about football?” Then he stood me before a microphone and asked me to broadcast an  46  game.

On my way home, as I have many times since, I thought of my mother’s words. I often wonder what  47 my life might have taken if I’d gotten the job at Montgomery Ward.  

36. A. faced                       B. received                    C. considered             D. met

37. A. old                          B. previous                    C. early                    D. original

38. A. layer                        B. manager                    C. announcer             D. fan

39. A. job                          B. suggestion                 C. chance                  D. advantage

40. A. While                      B. When                        C. Which                   D. So

41. A. worker                     B. student                      C. announcer             D. athlete

42. A. accepted                   B. agreed                       C. applied                  D. promised

43. A. come                       B. shown                      C. disappeared           D. brightened

44. A. turned over               B. hit over                     C. boiled over            D. took over

45. A. murmuring               B. calling                      C. whispering            D. announcing

46. A. forceful                    B. close                         C. imaginary              D. ordinary

47. A. side                         B. action                       C. approach               D. direction

单项选择题