when television first began to expand, very few of the people who had become famous as __71__ announcers were able to be equally effective __72__ . some of the difficulties they experienced when they were trying to __73__ themselves to the new medium were technical. when __74__ on radio, for example, they had become __75__ to seeing on behalf of the listener. this art of seeing for others __76__ that the announcer has to be very good __77__ talking. above all, he has to be able to __78__ a continuous sequence (序列) of visual (视觉的) images which add meaning __79__ the round the listener hears. in the __80__ of television, however, the announcer sees __81__ with the viewer. his duty, __82__, is completely different. he is there to make __83__ that the viewer does not __84__ any point of interest, to help him focus __85__ particular things, and to help him __86__ the images on the television screen. __87__ his radio colleague, he must know the __88__ of silence and how to use it at those __89__ when the pictures speak for __90__.
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n71. a) television b) advertisement c) radio d) newspaper
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n72. a) of b) in c) at d) on
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n73. a) adopt b) adjust c) alter d) adapt
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n74. a) working b) listening c) appearing d) showing
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n75. a) practiced b) experienced c) determined d) used
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n76. a) guarantees b) means c) convinces d) warns
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n77. a) at b) with c) in d) of
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n78. a) reflect b) create c) cause d) affect
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n79. a) to b) in c) on d) about
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n80. a) occasion b) matter c) example d) case
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n81. a) something b) everything c) nothing d) anything
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n82. a) moreover b) therefore c) furthermore d) nevertheless
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n83. a) clear b) definite c) sure d) easy
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n84. a) miss b) ignore c) drop d) catch
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n85. a) to b) at c) in d) on
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n86. a) reveal b) expose c) understand d) translate
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n87. a) unlike b) besides c) like d) as
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n88. a) price b) cost c) value d) worth
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n89. a) minutes b) periods c) times d) moments
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n90. a) them b) him c) themselves d) himself
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n答案：
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n71-75 cdbad 76-80 babad 81-85 bbcad 86-90 cacdc