43. The new music was built out of materials already in existence.

　　44. They freely took over elements from jazz， from American country music， and as time went on from even more spanerse sources.

　　45. What developed was a music readily taking on various forms and capable of an almost limitless range of expression.

　　46. In studio recordings， new techniques made possible effects that not even an electronic band could produce live.

　　47. Electronic amplifiers also made possible a fantastic increase in volume， the music becoming as loud and penetrating as the human ear could stand

　　48. Often music was played out of doors， where nature provided the environment.

　　49 The social and political transformation of a country is essential to the development of the society.

　　50. All theories originate from practice and in turn serve practice..

　　Unit 6

　　51. Robots， becoming increasingly prevalent in factories and industrial plants throughout the developed world， are programmed and engineered to perform industrial tasks without human intervention. 52. The robots used in nuclear power plants handle the radioactive materials， preventing human personnel from being exposed to radiation. 53. Robots differ from automatic machines in that after completion of one specific task， they can be reprogrammed by a computer to do another one. 54. Other engineers are writing new programs allowing robots to make decisions such as whether to discard defective parts in finished products. 55. These future robots， assembled with a sense of touch and the ability to see and make decisions， will have plenty of work to do. 56. Anyone wanting to understand the industry of the future will have to know about robotics. 57. His words cast a new light on the problem. 58. We should be aware of the dangers of exposing children to violence on TV.

　　Unit 7

　　59. People in advanced indu

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