While he was investigating ways to improve the telephone,Newton made ________ discovery which completely changed ________ man's understanding of color．


  1. A.
    a;/
  2. B.
    a;the
  3. C.
    /;the
  4. D.
    the;a
A
解析：
discovery發(fā)現(xiàn)，前加不定冠詞表泛指；
第二空后man一詞的單數(shù)形式且前無冠詞，意為“人類”。
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