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C.is located near a national park D.was built by a family of beavers 30.Why do beavers build dams? A.To make themselves swifter. B.To compete against the predators. C.To make it easier to find food. D.To make a good living environment. 31.What can be inferred from the last paragraph? A.Beaver dams can cause flood. B.Beavers mainly live on plants. C.Man can benefit from beaver dams. D.Beaver dams can change the climate.