来源：网络 2020-02-13 10:33:47
Preserving Our Environment
Man is slowly polluting his environment. He dirties the air with waste gases; he poisons the water with chemical wastes; he damages the soil with fertilizers.
Pollution does great harm to man. As we know, air and soil are necessary to man´´s survival. Polluted air, water and soil make people sick and even cause deaths. Environmental pollution is becoming one of the most serious problems that mankind faces.