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    【题目】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】

    考查形容词辨析。句意：高速公路隔声屏障作为一种经济有效的方法，是降低交通噪声的主要措施。A. correctional 修正的；B. flexible灵活的；C. economical经济的；D. investigative研究的，故选C。

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