【简答题】A.When the ecological balance of the river is lost. B.When people consume more fish than they used to. C.When large numbers of algae, fish and birds are killed. D.When the production of marine petrole...
【简答题】A.When the ecological balance of the river is lost. B.When people consume more fish than they used to. C.When large numbers of algae, fish and birds are killed. D.When the production of marine petrole...