填空题 Dams vary (in size) (from small rock barriers to) concrete structures (many feet) (height). A. in size B. from small rock barriers to C. many feet D. height
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【正确答案】 1、D    
【答案解析】改为high。表示长度、重量等单位的名词后接形容词，结构为：数词+feet long/high。