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．set up |
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．set up |
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