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环境保护是人类永恒的主题。我们每个人都应为之贡献自己的小小力量。Once man did not have to think about environmental protection.There were few people onthe earth,and natural resources seemed to be unlimited.Today things are different.The world has become too crowded.We are using up our naturalresources and polluting our environment with dangerous chemicals.If we continue to do this,hu
Environmental protection is the eternal theme of mankind. Each of us should contribute our own little strength. Once man did not have to think about environmental protection. Here are few people on the earth, and natural resources seemed to be unlimited. Today’s things are different. The world has become too crowded. We are using up our naturalresources and polluting our environment with dangerous chemicals.If we continue to do this, hu