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

分析 我們把書放進書柜目的不落上灰塵.

解答 答案:B 
empty 意思是"空的",free  意思是"自由的,免費的",aware 意思是"意識到",short  意思是"短的,矮的",keep…free of…是固定搭配,意思是"免于.;避免". 所以根據句意中"我們把書放進書柜"的"目的"是為了避免灰塵,可知本題應該選擇B.

點評 了解句意,弄清楚形容詞和一些動詞搭配的特殊含義.

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