The phrase "immune to" (Line 3, Para. 1) are used to mean ______. Which of the following best states the main idea of the passa

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问题 The phrase "immune to" (Line 3, Para. 1) are used to mean ______.
Which of the following best states the main idea of the passage?

选项 A、Noise is a major problem; most people recognize its importance.
B、Although noise can be annoying, it is not a major problem.
C、Noise is a major problem and has not yet been recognized as such.
D、Noise is a major problem about which nothing can be done.

答案C

解析 主旨题。通读全文可知,文章主要论述了噪音是影响健康的主要原因,但人们并没有意识到噪音的危害之大,所以C正确。
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