PSAT Reading Question 146: Answer and Explanation

Question: 146

As used in line 20, "concentration" most nearly means

A. focus.
B. application.
C. density.
D. awareness.

Correct Answer: C

Explanation:

Difficulty: Easy

Category: Vocab-in-Context

Getting to the Answer: Eliminate answer choices that are synonyms for "concentration" but do not make sense in context. In this sentence, the author is describing the amount of mercury in the air from power plants. "Concentration" most nearly means "density" in this context, so (C) is the correct answer.

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PSAT Reading Question 146: Answer and Explanation

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