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Câu hỏi:
According to the passage, the numerical value of the concentration level of a substance is only useful__________.
- A. the other substances in the area are known
- B. it is in a localized area
- C. the naturally occurring level is also known
- D. it can be calculated quickly
Lời giải tham khảo:
Đáp án đúng: C
Dẫn chứng: ...in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area...
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