Stop and listen! What do you __36__? You may hear many different sounds. Some of the sound __37__ noise. Noise is a loud or unwanted sound. Noise can be caused by many kinds of machines, __38__, cars, planes, farm tractors (拖拉机) and so on. And, to some people, rock music is __39__ a noise. What happens __40__ people who live near noisy machines or use them over a period of time? Doctors have found that these people have trouble __41__. But, more importantly, constant loud noise can cause a loss of __42__.

Scientists use a unit of measure __43__ a decibel to check the loudness of a sound. The sound of a quiet room, for example, measures 35 decibels. Talking measures __44__ 40 and 65 decibels. Sounds from traffic and from some rock bands can measure over 120 decibels. Noise at this high level __45__ the greatest hearing loss.

36. A. look       B. listen       C. hear          D. see

37. A. may be     B. maybe       C. may          D. be

38. A. such      B. for example    C. such like      D. some examples

39. A. not           B. as well      C. too          D. also 

30. A. with      B. to             C. on        D. about

41. A. in sleeping B. to sleep    C. slept         D. sleep

42. A. hear       B. ears          C. heard       D. hearing

43. A. called     B. is named     C. calling           D. names

44. A. from       B. between      C. both         D. among

45. A. reaches      B. does          C. causes        D. is

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