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B. The earliest sewers utilized in ancient India.
A. Waterborne diseases were reduced after the introduction of water treat-
ment.
B. The introduction of water treatment reduced waterborne diseases.
5. Say the same using a different voice. (Change Active Voice => Pas-
sive Voice / Passive Voice => Active Voice)
1. The Romans constructed aqueducts to prevent drought.
2. Restricting laws are developed in many countries.
3. Malaria was controlled as a result of application of DDT.
4. Many species were brought to the verge of extinction due to the impact
of the DDT.
5. Conservation movement and restricting laws improve environment.
6. People apply thoughtful principles to improve the quality of their envi-
ronment.
7. Joseph Bazalgette designed the first major sewerage system in the 19
th
century.
6. Guess the words.
1. A colorless odorless substance used as an insecticide.
2. A drain or pipe used to carry away surface water or wastes.
3. Any organism that damages crops, livestock or man, or reduces the fer-
tility (плодородие) of land.
4. Improving quality of water so that it were safe for drinking.
5. Providing treated and purified water for a community.
7. Read the text ENVIRONMENTAL MANAGEMENT and give defini-
tions to these terms and abbreviations:
• environmental management
• ISO
• ESM
• unusables
ENVIRONMENTAL MANAGEMENT
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