2. 外语
  3. The computer ______. Engineers have worked on computers for ______.

The computer ______. Engineers have worked on computers for ______.

admin2009-09-17  33
问题 The computer ______.
Engineers have worked on computers for ______.
选项 A、about a whole century
B、more than twenty-five years
C、over three months
答案B
解析 根据本文“for a quarter of a century”可知工程师们在大约25年前已经研制出了越来越好的计算机。
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