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【題目】As a(n) ________ and effective method, expressway noise barrier is a primary measure used to reduce traffic noise.

A. correctionalB. flexibleC. economicalD. investigative

【答案】C

【解析】

考查形容詞辨析。句意：高速公路隔聲屏障作為一種經濟有效的方法，是降低交通噪聲的主要措施。A. correctional 修正的；B. flexible靈活的；C. economical經濟的；D. investigative研究的，故選C。

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