The haze of pollution mentioned in the first paragraph is a cloud ______. Which of the statements is closest in meaning to the

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问题 The haze of pollution mentioned in the first paragraph is a cloud ______.
Which of the statements is closest in meaning to the sentence "...,we expect that sources in Europe will contribute less than Asian sources"?

选项 A、Pollution is expected to be less serious in Europe than in Asia.
B、Pollution is studied in more depth in Europe than in Asia.
C、Pollutants coming from Europe are not the main source of pollution in North America.
D、Pollutants coming from Europe are the main source of pollution in North America.

答案C

解析 首先找到该句在文章中的位置,注意到句子中提到sources in Europe和Asian sources,借助前句中“来自欧洲的污染”(pollution coming from Europe)和“欧洲的源头也能跨越太平洋”(European sources also can be transported across the Pacific)判断问题句中提到的sources in Europe和Asian sources分别是“欧洲的污染源”和“亚洲的污染源”,因此C是答案。
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