GRE Text Completion Question 182
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Source: XDF
Nature's energy efficiency often_____human technology: despite the intensity of the light fireflies produce, the amount of heat is negligible; only recently have humans developed chemical light-producing systems whose efficiency_____the firefly's system.
| Blank(i) | Blank(ii) |
|---|---|
| A outstrips | D stimulates |
| B inhibits | E rivals |
| C determines | F reproduce |