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 (放大器), can _53_ 120 decibels (分贝) 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

50. He is ready to help others. So we _____ him ______ monitor.

A. made; the 　　　　 B. elected; the　　　　　 C. made; /　　　　　　　 D. expected; /

49. --- Could I use your bike?　　　　 　　　　 --- Yes, you ______.

A. could 　　　　　　　　 B. can　　　　　　　　　　 C. should　　　　　　　　 D. will

48. --- Must I finish all the work in one evening?　 　　--- No, you ________.

A. mustn’t　　　　　　　　 B. haven’t　　　　　　　　 C. don’t have to　　　 D. needn’t to

47. The problem is too complex. We ought to _______ a specialist.

A. call on　　　　　　　　 B. call at　　　　　　　　　 C. call for　　　　　　　　 D. call in

46. These wild flowers ______ a nice smell.

A. gives out 　　　　　　 B. sends out 　　　　　 C. give off　　　　　　　 D. send off

45. The room ______ 10 meters across.

A. is　　　　　　　　　　　　 B. measures　　　　　　 C. is measured　 　　 D. A or B

44. When you listen to a teacher, ________ what you think is important.

A. write　　　　　　　　　 B. make notes of 　　 C. take notice　　　　　 D. hear　

43. ________ can we finish the work within three days.

A. By no way　　　　　 B. In this way　　　　　 C. By no means　　　　 D. By this means

42. You can arrive in Guangzhou on time for the fashion show ______ you don't mind taking the night train.

A. provided　　　　　　　 B. unless　　　　　　　　 C. though　　　　　　　　 D. until