According to the data, 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．build up |
| C．make up | D．polish up |
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According to the data, 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．build up |
| C．make up | D．polish up |
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