In 1948, three American scientists invented ____ transistor, which is ____ small electronic device to control an electric current.


  1. A.
    the; a
  2. B.
    a; a
  3. C.
    the; the
  4. D.
    a; the
A
試題分析：考查冠詞：發(fā)明物的單數(shù)名詞前用定冠詞，由此可排除B、D。后面一空用不定冠詞，表示“一種(小設備)”。句意：1948年，三位美國科學家發(fā)明了晶體管——一種能控制電流的小型電子器件選A。
考點：考查冠詞
點評：對于冠詞，要注意不定冠詞表示泛指，定冠詞表示特指。還有不加冠詞的時候。
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