Which sentence is different in meaning from the other three？


  1. A.
    A computer is a useful machine．
  2. B.
    Computers are useful machines．
  3. C.
    The computer is a useful machine．
  4. D.
    The computers are useful machines．
D
分析：表示“泛指”或“類”的概念時，不僅可以用不定冠詞，還可以用不帶定冠詞的復(fù)數(shù)形式，在一定的上下文中(不會引起誤解)可以用定冠詞+單數(shù)名詞來表示“類”。此處A，B，C都是“類指”的意思，而D項是指“這些計算機”，是“特指”的概念。(延伸)The computer is a useful machine．是“類指”，而The computer is mine．是“特指”。
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