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：成都的生活費(fèi)用是中國最低的，而生活質(zhì)量可能是最高的。考查連詞辨析題。while與…同時(shí)，強(qiáng)調(diào)主句和從句相反；when當(dāng)時(shí)候，用于主句和從句動(dòng)作有先后順序時(shí)；as當(dāng)……的時(shí)候，強(qiáng)調(diào)主句動(dòng)作隨從句動(dòng)作而變化；since自從，后接時(shí)間段或從句，表示一段時(shí)間，用于現(xiàn)在完成時(shí)態(tài)。根據(jù)句意語境，可知兩句意思相反，故選A。
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