单选题:According to the passage, the numerical value of the concent

  • 题目分类:英语四级
  • 题目类型:单选题
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题目内容:
According to the passage, the numerical value of the concentration level of a substance is only useful if A.the other substances in the area are known
B.it is a localized area
C.it can be calculated quickly
D.the naturally occurring level is also known

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