Question

【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

Answer 1

【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(jīng)濟(jì)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(jīng)濟(jì)的；D. investigative研究的，故選C。