B2. Fill in the omitted word and also give the words 'Before and After' it.
Before
1. The city's oxygen chamber a zone
2. Where hundreds anti – polluting
plants
3. have been kept create a green zone.
4. The place is divided three sections
with a nursery, greenhouse and can
Outdoor area
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Answer:
pH and Water
No, you don't often hear your local news broadcaster say "Folks, today's pH value of Dryville Creek is 6.3!" But pH is quite an important measurement of water. Maybe for a science project in school you took the pH of water samples in a chemistry class ... and here at the U.S. Geological Survey we take a pH measurement whenever water is studied. Not only does the pH of a stream affect organisms living in the water, a changing pH in a stream can be an indicator of increasing pollution or some other environmental factor.
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