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题目材料：
Crows, herring gulls, and sparrows all live on the island of Firsten. Crows feed on sparrow eggs and the therefore pose a threat to the sparrow population. Although gulls are not nearly as good at finding sparrow nests as crows are, sparrows typically also lose some eggs to gull predation. Nevertheless, sparrows that nest near gull nests tend to lose fewer eggs to predators than sparrows nesting far away from gull nests, since ________ .
以上解析由 考满分老师提供。
