随着科技的发展，我们的环境所受到的污染越来越严重。河流，空气都受到了污

With the development of science and technology, our environment by pollution is getting worse. Rivers, are subject to air pollution, air pollution is most serious, and the air is something we live, air pollution to human life caused great threat, which is rooted in human activity, so we should reduce the car emissions, more than the bus.

With the development of science and technology, the pollution of our environment is becoming more and more serious. Rivers, air are polluted, air pollution is the most serious, and air is our survival of things, air pollution to human life has a great threat to human activities, the root cause is human activities, so we should reduce the emissions of cars, take more buses.

With the development of science and technology, the pollution of our environment is more and more serious. Rivers and air have been polluted, and air pollution is the most serious, and air is what we rely on for survival. Air pollution poses a great threat to human life, and its root lies in human activities, so we should reduce the emissions of cars and take more buses.<br>