1. There are two kinds sources of polluiton: acid rain and car exhaust fumes.

2. Because it gives out smoke that contains sulphur dioxides and nitrogen oxide.

3. It has harmed aquatic life by turning many lakes into lifeless bodies of water.

4. Yes, they are.

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There are many sources of pollution in our modern world. At present, the most serious sources are acid rain and car exhaust fumes. Factory chimneys give out smoke that contains sulphur dioxides and nitrogen oxide. These gases combine with the atmosphere to form sulphuric acid and nitric acid. When it rains, these Acids dissolve in the rain and make it acidic, Acid rain is believed to be the worst pollution problem of all. It has harmed aquatic life by turning many lakes into lifeless bodies of water. In these areas, there is no limestone into acid lakes.

However, it is not possible to do this on a large enough seale to save all the lakes. Car exhaust fumes contain carbon monoxide and lead which are highly poisonous. In big cities, the exhaust fumes build up and pose a health hazard to human beings.

1. How many sources of pollution are mentioned in the passage?

- There are two kinds. They are acid rain and car exhaust fumes.

2. Why is smoke from factory chimneys harmful to our environment?

- Because it gives out smoke that contains sulphur dioxides and nitrogen oxide.

3. How has acid rain harmed aquatic life?

- It has harmed aquatic life by turning many lakes into lifeless bodies of water.

4. Are carbon monoxide and lead extremely poisonous?

-Yes, they are.

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Xin hay nhất!!