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题目内容
Because many of the minerals found on the ocean floor are still (i)_____ on land, where mining is relatively inexpensive, mining the ocean floor has yet to become a (ii)_____ enterprise.
- Ascarce. . common
- Baccessible.. marginal
- Cunidentified.. subsidized
- Dconserved . . public
- Eplentiful.. profitable
E显示答案
以上解析由 考满分老师提供。