2021年6月大学英语六级真题试卷（1）

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Mice, deer, birds, snakes and frogs are among their victims. They can also harm other wild species through indirect competition rather than eating them or shrinking theirfoodsupply. Ononeparticular United Statesisland, wild pigsthemselves became an attractive food source for a species of mainland eagle. Eagles began breeding on the island

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