8．Milk quickly goes bad in summer ____ it is in a fridge．（　�。�
A．ifB．becauseC．unlessD．when

分析 除非將牛奶放在冰箱里，否則牛奶會在夏天迅速變質(zhì)．

解答 答案：C．根據(jù)Milk quickly goes bad in summer和it is in a fridge的關(guān)系可知，牛奶會迅速變質(zhì)，條件是不放在冰箱里；也就是說，除非將牛奶放在冰箱里，否則牛奶會在夏天迅速變質(zhì)．unless表示"除非"的意思，相當于if…not"如果…不"．本句意思也可以翻譯成：牛奶如果不放在冰箱里，就會迅速變質(zhì)．故選C．

點評 做本題時，應(yīng)注意前后句的關(guān)系，只有理清他們的關(guān)系，了解各個選項的意思，方能選出正確的答案．

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