3, Because of human's activities ,the problems of water pollution, air pollution, light pollution and destruction of forests have occured, the greenhouse effect, soil erosion, ozone hole , the radiation broug
保护野生动物的英语作文带翻译 篇1 Dinosaurs died out because of an unexpected incident. But wildlife today disappears or is in danger just because humans do harm to it. For example, tigers are hunted for fur to make