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Since a large number of the ores frequently located in riverbeds are (i)_____on the earth's surface, where the processing of chemicals is less costly, recovery of underwater ores is not likely to become a (ii)_____procedure.
- Blank(i)
- scanty
- abundant
- preserved
- Blank(ii)
- valuable
- cost-effective
- rejected
abundant , cost-effective 显示答案
以上解析由 考满分老师提供。
