Question:
According to the passage, the numerical value of the concentration level of a substance is only useful if _____?
-
A.
it is in a localized area -
B.
the other substances in the area are known -
C.
it can be calculated quickly -
D.
the natural level is also known
Reference explanation:
Correct Answer: EASY
Explain:
According to the passage, the numerical value of the concentration level of a substance is only useful if _____?
A. it is located in a local area
B. know other substances in the area
C. it can be calculated quickly
D. know the natural level
Information:
“in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would naturally occur in the area” much higher than the concentration in nature)
→ Choose the EASY answer
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