GRE Text Completion Question 1744
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Source: CQ
By (i)_____ many aspects of natural river ecosystems, some dams cause serious harm, producing (ii)_____ effects on water, land, wildlife, and even the atmosphere.
| Blank(i) | Blank(ii) |
|---|---|
| A obliterating | D negligible |
| B altering | E salutary |
| C ameliorating | F deleterious |