While hewas investigating ways to improve the telescope, Newton made _________ discoverwhich completely changed______ man’s understanding of color.


  1. A.
    a; 不填
  2. B.
    a; the
  3. C.
    不填; the
  4. D.
    the; a
A
解析：
考查冠詞的用法。第一空表示泛指。
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