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GRE Verbal Reasoning QUESTION #8004
Question 1
There are, as yet, no vegetation types or ecosystems whose study has been ------- to the extent that they no longer ------- ecologists.
  • perfected...hinder
  • exhausted...interest✔️
  • prolonged...require
  • prevented...challenge
Correct Answer Explanation
The sentence suggests that no ecosystem has been studied so thoroughly that scientists have lost interest in it. The first blank needs a word meaning 'fully explored' or 'depleted,' and the second needs a word meaning 'engage' or 'attract.' Exhausted...interest fits perfectly: no ecosystem has been studied to exhaustion (completely used up as a subject of study) such that it no longer interests researchers—there's always more to discover.