Refining is the process of ________ these impurities from the pu

Refining is the process of ________ these impurities from the pure metal.
A、planting
B、separating
C、manufacturing
D、conducting
【正确答案】：B
【题目解析】：plant种植；seperate分离；manufacture制造；conduct组织，实施
句意：精炼是从纯金属中分离这些杂质的过程。