GRE Text Completion Question 1175
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Source: Red
Nature's energy efficiency often (i) _____ human technology: despite the intensity of the light fireflies produce, the amount of heat is negligible; only recently have humans developed chemical lightproducing systems whose efficiency (ii) _____ the firefly's system.
| Blank(i) | Blank(ii) |
|---|---|
| A outstrips | D stimulates |
| B inhibits | E rivals |
| C determines | F reproduce |