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수능 영어 · 무관한 문장 [3점]

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Cities are noisy places, and that noise is reshaping how some animals communicate. Studies of urban songbirds have found that many of them sing at a higher pitch than their rural relatives. (1) Low-frequency traffic noise masks the lower notes of a song, so a bird that sings higher is more likely to be heard by a mate or a rival. (2) Many city residents, meanwhile, report that birdsong is one of the few natural sounds they still notice on their way to work. (3) Some of the birds also sing louder, or more often, during rush hour, when the din is at its peak. (4) The extra effort is not free, however, because singing louder costs energy that could otherwise go to feeding or raising young.

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