GRE Text Completion Question 3438
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Source: NO7
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 light-producing systems whose efficiency（ii）_____the firefly's system.
- A engenders.. manipulates
- B reflects.. simulates
- C outstrips.. rivals
- D inhibits.. matches
- E determines.. Reproduces