GRE Text Completion Question 2906
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Source: 1991
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.
- A scarce. . common
- B accessible.. marginal
- C unidentified.. subsidized
- D conserved . . public
- E plentiful.. profitable