When you have studied this session, you should be able to:
- Define and use correctly all of the key words printed in bold
- Describe the main types of pollution.
- Describe the sources of pollution and the way pollutants reach the environment.
- Describe the main characteristics of water, air and soil pollution.
آخری ترمیم: جمعه, 7 اکتوبر 2016, 10:00 ش