属于大众传播机械性干扰的是（）
A.广播杂音
B.信号干扰
C.技术水平低
D.无广播线路
E.心理故障
参考答案：A
解析：大众传播障碍分两种：一种是讯息障碍，包括机械性干扰，如广播杂音、图像失真；人为因素干扰如技术水平低、工作态度消极等。第二种是传播障碍，主要是渠道没有建立或出现故障，如没有广播线路、没有电视信号等。因此，分清这些问题之后，答案就很容易选择了。
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| I remember the exact moment I learned the principle of preparing for luck. I was on the wrestling (摔跤) team. Now, if there's one thing I can tell you about any sport, it is that wrestling is probably the sport that has the least 1 .There are only two people out on the mat, so you cannot 2 it on your teammates or your coach. And guess what? There is no 3 problem because we do the whole thing indoors, so you can't say, "It was raining" or "It was snowing." It makes 4 to say wrestling is the sport with the least luck. On our team were two world champions; one of them had been a world champion five times. We 5 had five people who were national champions. One of them was a guy 6 the name of John. John had never been 7 in any high school wrestling competition that I could remember, 8 he was a national champion. There was nobody locally who could touch him. One day, we 9 a match with our biggest opponent (对手). John went out on the mat, and about a minute and 30 seconds into the match he tried to make a particular 10 He rolled over, and his opponent 11 him halfway through his roll. He was pinned (压住) 12 ! The match was over. I remember on the way home, one of our teammates tried to 13 John by saying, "Oh, he just got lucky." John said, "That's so stupid. The 14 presented itself, and he just drew upon it." We used to have this big 15 in our wrestling room that the coach had put there: "Luck is what happens when opportunity meets 16 ." John's opponent was prepared to make use of this opportunity. The possibility of beating John was not 17 and he knew it. But he waited for the 18 opportunity to present itself, and he defeated and pinned a five-time national champion. In other words, the real 19 is "Be prepared!" It's not just finding the opportunity; you have to be prepared to 20 it. | ||||
| ( )1. A. luck ( )2. A. trust ( )3. A. alarm ( )4. A. reason ( )5. A. also ( )6. A. as ( )7. A. teased ( )8. A. although ( )9. A. went for ( )10. A. act ( )11. A. fixed ( )12. A. accidentally ( )13. A. control ( )14. A. power ( )15. A. sample ( )16. A. occasion ( )17. A. tiny ( )18. A. equal ( )19. A. message ( )20. A. attain | B. relief B. blame B. injury B. difference B. even B. for B. met B. as B. waited for B. scratch B. forgave B. controversially B. comfort B. moment B. sign B. challenge B. strong B. subtle B. theme B. follow | C. difficulty C. doubt C. change C. privilege C. thus C. beneath C. scolded C. yet C. fought for C. task C. caught C. unfairly C. pat C. opportunity C. sentence C. time C. acute C. rest C. formula C. seize | D. chance D. betray D. weather D. sense D. once D. by D. defeated D. until D. played for D. move D. interrupted D. immediately D. depress D. situation D. symbol D. preparation D. slight D. right D. suggestion D. create | |