18．Jim will become fatter and fatter             he eat less junk food．（　�。�
A．becauseB．ifC．unless

分析 除非Jim少吃垃圾食品，否則他會(huì)越來越胖．

解答 答案：C．
本題考查的是從屬連詞的辨析．根據(jù)語境推測句意是"除非Jim少吃垃圾食品，否則他會(huì)越來越胖．"從句意來看，這里需要一個(gè)表假設(shè)的連詞，說明后句是表假設(shè)的條件狀語從句，結(jié)合選項(xiàng)，unless可以引導(dǎo)一個(gè)表假設(shè)的條件狀語從句，意為"除非"，相當(dāng)于if not．故選C．

點(diǎn)評 本題主要考查連詞的用法，做此類題目一定要弄清句意，明白上下文之間的關(guān)系，才能更好地判斷出所要用的連詞．再就是要熟記固定短語和句型．

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