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【题目】White noise consists of________ collections of sounds at different frequenciessuch as the dull noise of aircraft engines.

A.swiftB.fierceC.randomD.generous

【答案】C

【解析】

考查形容词词义辨析。句意:白噪音由不同频率的声音随机组合而成,例如飞机引擎的沉闷噪音。A. swift 快速的;B. fierce 凶猛的;C. random 随意的,随机的;D. generous 慷慨的。分析句子,根据后面提到的“例如飞机引擎的沉闷噪音”可知,白噪音是有不同频率的声音随机组合。故选C项。

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