Chemists find _____ to detect and measure the amount of chlorine in any given water supply.


  1. A.
    are easy
  2. B.
    easily
  3. C.
    it easy
  4. D.
    how easily
C
解析：
后面的the amount of chlorine in any given water supply.雖然并不重要，但其過去分詞given的用法和supply作為名詞的使用以及名詞water作為定語的使用特點，都值得注意。
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