◎ 题干
China supplies more than 90 percent of the world's rare earth metals, but its reserves only _________
about one-third of the world's total.  
  [     ]
A. take up            
B. make up        
C. build up          
D. polish up
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“China supplies more than 90 percent of the world's rare earth metals, but its reserves only _________ about one-third of the world's total. [ ]A. take upB.…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。