Few people in big cities seem to mind noise. They like to enjoy music _51_ they are doing dull jobs. It¡¯s a new danger because music, when _52_ through powerful amplifiers (·Å´óÆ÷), can _53_ 120 decibels (·Ö±´) at a distance of five feet. It is ¡¡54 ¡¡to us that a continuous noise of over 85 decibels can cause ¡¡55 . Recently it was discovered that many young Americans could hear ¡¡56 ¡¡60-year-old people.

¡¡ In the past we ¡¡57_ that only workers in very noisy places became deaf. For example, when newspapers and books ¡¡58_, the noise is about 85 decibels, and some workers become deaf.

¡¡ Noise of _59_ 85 decibels can make some people ¡¡60 ¡¡and anxious. We all know that _61_ noise makes life difficult and unpleasant. It can injure people¡¯s ears and prevent people _62_well. Workers in noisy offices are ¡¡63 ¡¡efficient as workers in ¡¡64 ¡¡offices. Noise makes people less efficient. Can anything ¡¡65 ¡¡to reduce noise?

¡¡ In many countries, several laws have recently ¡¡66 ¡¡to reduce noise. ¡¡67_ money has been _68_ in making airports and main roads quieter. Scientists all over the world are trying their best to find out one way or ¡¡69 ¡¡to ¡¡70 ¡¡noise.

51. A. if¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. since¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡ C. when¡¡¡¡¡¡¡¡ ¡¡¡¡ D. because

52. A. was played¡¡ ¡¡¡¡¡¡ B. played¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡ C. being played¡¡ ¡¡¡¡ D. playing

53. A. get to¡¡¡¡¡¡ ¡¡¡¡¡¡ B. reach¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡ C. arrive¡¡¡¡¡¡ ¡¡¡¡¡¡ D. exist

54. A. known¡¡¡¡¡¡ ¡¡¡¡¡¡ B. reported¡¡ ¡¡¡¡¡¡¡¡ C. believed¡¡¡¡¡¡ ¡¡¡¡ D. thought

55. A. deaf¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡ B. blindness¡¡ ¡¡¡¡¡¡¡¡¡¡ C. sick¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡ D. deafness

56. A. not better than ¡¡¡¡ B. no stronger than C. no better than¡¡ ¡¡ D. not stronger than

57. A. were used to considering¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. used to think¡¡

C. were considering¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. were thinking

58. A. are being printed¡¡ B. were printed¡¡ ¡¡¡¡ C. were being printed¡¡ D. are printed

59. A. no more than¡¡¡¡ B. better than¡¡¡¡ ¡¡¡¡ C. less than¡¡¡¡ ¡¡¡¡ D. more than

60. A. pleasant¡¡¡¡¡¡¡¡ B. tiring¡¡¡¡¡¡¡¡ ¡¡¡¡ C. excited¡¡¡¡ ¡¡¡¡¡¡ D. tired

61. A. too much¡¡¡¡ ¡¡¡¡ B. much more ¡¡¡¡¡¡¡¡ C. many more¡¡¡¡ ¡¡ D. much too

62. A. from work¡¡¡¡ ¡¡ B. working¡¡¡¡¡¡ ¡¡¡¡ C. to work¡¡¡¡ ¡¡¡¡¡¡ D. from the work

63. A. as¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡ B. not like¡¡¡¡ ¡¡¡¡¡¡¡¡ C. so¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡ D. not as

64. A. still¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡ B. good¡¡¡¡¡¡¡¡ ¡¡¡¡ C. quiet¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡ D. poor

65. A. do¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡ B. be done¡¡¡¡ ¡¡¡¡¡¡¡¡ C. done¡¡¡¡¡¡¡¡ ¡¡¡¡ D. to do

66. A. been made¡¡¡¡ ¡¡¡¡ B. signed¡¡¡¡¡¡ ¡¡¡¡¡¡ C. made¡¡¡¡¡¡ ¡¡¡¡¡¡ D. been signed

67. A. Dozens of¡¡ ¡¡¡¡¡¡ B. A great deal of¡¡ ¡¡ C. A number of¡¡ ¡¡¡¡ D. A good many

68. A. paid¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡ B. cost¡¡¡¡¡¡¡¡ ¡¡¡¡ C. spent¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡ D. taken

69. A. the other¡¡¡¡ ¡¡¡¡ B. another¡¡¡¡¡¡ ¡¡ C. other¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡ D. much

70. A. keep up¡¡¡¡¡¡ ¡¡ B. keep off¡¡ ¡¡¡¡¡¡¡¡ C. keep out¡¡¡¡¡¡ ¡¡ D. keep down

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