12．You won't lose weight        you go on diet and take exercise regularly．（　�。�
A．ifB．unlessC．becauseD．so

分析 除非你經(jīng)常節(jié)食和鍛煉，否則你是不會減肥的．

解答 答案B．
so表示因果意義的并列連詞，并列連詞用來連接平行的詞、詞組和分句．因此可排除D．if"如果"，引導條件狀語從句．unless"除非，如果不"，在意義上相當于if…not，因此在有些場合中unless與if…not可互換使用，引導條件狀語從句．because"因為"，引導原因狀語從句．分析可知前后兩句話之間是邏輯上的"條件"關系，可排除C；再結(jié)合句子所表達的意思可知答案選B．

點評 本題考查從屬連詞的用法．連詞的用法辨析，要注意分析主從句之間的邏輯關系，再確定相應的連詞，同時注意不同的連詞的語義及用法區(qū)別．

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