【題目】White noise consists of________ collections of sounds at different frequencies，such as the dull noise of aircraft engines.

A.swiftB.fierceC.randomD.generous

【答案】C

【解析】

考查形容詞詞義辨析。句意：白噪音由不同頻率的聲音隨機(jī)組合而成，例如飛機(jī)引擎的沉悶噪音。A. swift 快速的；B. fierce 兇猛的；C. random 隨意的，隨機(jī)的；D. generous 慷慨的。分析句子，根據(jù)后面提到的“例如飛機(jī)引擎的沉悶噪音”可知，白噪音是有不同頻率的聲音隨機(jī)組合。故選C項。

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