题目内容

15．We put our books in the bookcase to keep them      of dust．（　　）
A．emptyB．freeC．awareD．short

分析 我们把书放进书柜目的不落上灰尘．

解答 答案：B 
empty 意思是"空的"，free  意思是"自由的，免费的"，aware 意思是"意识到"，short  意思是"短的，矮的"，keep…free of…是固定搭配，意思是"免于．；避免"． 所以根据句意中"我们把书放进书柜"的"目的"是为了避免灰尘，可知本题应该选择B．

点评 了解句意，弄清楚形容词和一些动词搭配的特殊含义．

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