单选题：According to the passage,the numerical value Of the concentr

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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答案解析：

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分类：英语四级题型：单选题