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  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.make up
C.build upD.set up
B

试题分析:句意:中国供应超过世界百分之90的稀土金属,但其储量只占世界总共的三分之一A. take up 采取; B. make up占据; C. build up建造; D. set up建立。根据句意,故选B。
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