1. C. a contamination of natural air with dangerous gases.

2. B. a consequence of the excess dumping of toxic waste.

3. G. a contamination of both drinking water from rivers, ponds and also sea water with large amounts of human and industrial wastes.

4. F. a disturbance of silent environment with harsh loud noises.

5. A. a result of using radioactive elements from atomic energy stations.

6. D. a consequence of releasing excess heat from power plants, industries involved in metals molding, etc

7. E. a consequence of the excessive and inappropriate use of artificial light.

1. C

2. G

3. B

4. F

5. A

6, D

7. E

Bn học tốt!!