【简答题】Hundreds of years ago, life was 1 harder than it is today. 2 People didn't have any modern machines, and there was no modern medicine, With the development of social economy, the 3 conditions of manki...
【简答题】A. Soil pollution. B. Water pollution. C. Air pollution. D. Sound pollution. 2. A. It is more polluted. B. It has fewer cars. C. It has clean air. D. It has less industry. 3. A. Industry. B. Cars. C. ...