In hot summer, milk quickly turns sour       it is refrigerated.
A．whileB．ifC．untilD．unless
D

試題分析：考查連詞，A. while當(dāng)…時候B. if如果C. until直到…D. unless除非，引導(dǎo)條件狀語從句，句子意思“在炎熱的夏季，牛奶很快變酸除非被冷藏”
點評：連詞是高考�？純�(nèi)容，判斷從句中用哪個連詞，需要記住連詞的用法，需要考生平時多練習(xí)，本題主要考查unless的用法，要求考生掌握好它的用法
即學(xué)即練：It will be quite a long time _______ she is back again, so don’t be too cross with her.
A. before                   B. since                C.that          D. until
選A
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