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

試題分析：句意：中國供應超過世界百分之90的稀土金屬，但其儲量只占世界總共的三分之一A. take up 采��； B. make up占據(jù)； C. build up建造； D. set up建立。根據(jù)句意，故選B。
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