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- 2. What do we know about it? How do we use it? What can we do for
- 3. Scientists investigate the problems of environment such as air, soil and water pollution, global warming, unreasonable
- 4. Environment is really important for human because of many factors. For example, plants are cleaning the
- 7. Some people have been interviewed and here are their answers
- 8. People and environment depend on each other. They can help each other or interfere. If a
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