GRE Text Completion Question 220
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Source: XDF
Exposure to sustained noise has been claimed to_____blood pressure regulation in human beings and, particularly, to increase hypertension, even though some researchers have obtained inconclusive results that_____the relationship.
| Blank(i) | Blank(ii) |
|---|---|
| A sharpen | D buttress |
| B increase | E obscure |
| C impair | F neutralize |