题目内容
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When television first began to expand,very few of the people who had become famous as 1 announcers were able to be equally effective on television. Some of the difficulties they experienced when they were trying to 2 themselves to the new medi-um were technical. When 3 on radio, for example, they had become 4 to seeing on behalf of the listener. This art of seeing for others 5 that the announcer has to be very good at talking. In the case of televi-sion, however, the announcer sees 6 with the viewer. His duty, 7 , is completely different. He is there to make sure that the viewer does not 8 any point of interest, to help him focus on particular things, and to help him 9 the images on the television screen. 10 his radio colleague, he must know the value of silence and how to use it at those moments when the pictures speak for himself.
