10 free GRE practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
GRE Practice Test 13Tutor mode
Question 1 of 10
Verbal Reasoning
The early settlers regarded the region's marshes as , a source of disease and an obstacle to farming, and they drained them with . Only in the twentieth century did ecologists begin to recognize the wetlands as , filtering water and sheltering countless species.