2. 外语
  3. During television’s first 20 years, deaf people missed most of the fun because they ______. A decoder is a machine to ______.

During television’s first 20 years, deaf people missed most of the fun because they ______. A decoder is a machine to ______.

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问题 During television’s first 20 years, deaf people missed most of the fun because they ______.
A decoder is a machine to ______.
选项
答案make the captions appear on the TV screen
解析 见原文最后一段，If a family had another kind of machine in their home or in their TV set，then the captions(or signals)would appear on their television screen．That special machine is called a decoder．
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大学英语四级

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