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The cost of living in Chengdu is among the lowest in China, ________ the quality of life is probably one of the highest.

A. while

B. when

C. as

D. since

A 【解析】句意:成都的生活费用是中国最低的,而生活质量可能是最高的。考查连词辨析题。while与…同时,强调主句和从句相反;when当时候,用于主句和从句动作有先后顺序时;as当……的时候,强调主句动作随从句动作而变化;since自从,后接时间段或从句,表示一段时间,用于现在完成时态。根据句意语境,可知两句意思相反,故选A。
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