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In ancient China, tin-rich ores were not as (i)_________ as copper-rich ores, and bronze—an alloy of copper and tin—was (ii)_________ material, as tin frequently had to be transported over large distances. As a result, unalloyed copper was probably used whenever (iii)________, since the metals used for farming and domestic purposes did not need to be as strong as the metals used for hunting and fighting.
- Blank(i)
- abundant
- valuable
- portable
- Blank(ii)
- an obsolete
- an expensive
- a perishable
- Blank(iii)
- unavoidable
- practical
- affordable
abundant , an expensive , practical 显示答案
以上解析由 考满分老师提供。
