9. Ответьте на следующие вопросы, опираясь на текст.

1. What are petroleum products?

2. What can refineries produce from crude oil?

3. What shares of petroleum products do you know?

4. What is often used as an intermediate product?

5. Have petrochemicals a vast variety of uses?

6. They are common by used as monomers, are not they?

7. How can polymer materials be used?

8. Where are lubricants used?