GRE Text Completion Question 550
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Source: XDF
Because many of the minerals found on the ocean floor are still_____ on land, where mining is relatively inexpensive, mining the ocean floor has yet to become a_____enterprise.
| Blank(i) | Blank(ii) |
|---|---|
| A scarce | D marginal |
| B unidentified | E profitable |
| C plentiful | F subsidized |