GRE Text Completion Question 777
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Source: Red
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.
| Blank(i) | Blank(ii) |
|---|---|
| A scarce | D marginal |
| B unidentified | E profitable |
| C copious | F subsidized |