When working on radio, for example, they had become used to seeing on behalf of the listener. This art of seeing for others __76__ that the announcer has to be very good at talking.
76. A) guarantees B) means C) convinces D) warns
答案是B 为什么不选C
In the case of television, however, the announcer sees everything with the viewer. His duty, __82__, is completely different. He is there to make sure that the viewer does not miss any point of interest, to help him focus on particular things, and to help him understand the images on the television screen.
82. A) moreover B) therefore C) furthermore D) nevertheless
答案是B 为什么不选D
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