To my mind; In my opinion; on the contrary; I'd like to say a few words about; it seems to be wrong; it is quite obvious that; as for; as I know

1. Lignite is a high-rank coal, containing about 90 per cent of
carbon. It is slightly liable to spontaneous combustion.

2. Bituminous coals cannot be stored in open piles. These coals
are primarily used for domestic purposes.

3. Anthracites are soft coals being used mainly for metallurgical
purposes. In future coal will be used only for domestic purposes.

37. Суммируйте содержание текста Б, используя следующие слова и
выражения:

coal ranks; carbon and volatile matter content; moisture con­tent; heat effect; liability to spontaneous combustion; coking quality; the use of different types of coal in industry

38. Подготовьте сообщение на тему:

Different types of coals and their comparison with each other (for example, lignite and anthracite or anthracite and brown coal, etc.), their carbon content, heat value, liability to spontaneous combustion and the use of each grade of coal.

Unlt6______________________________________________ 157

39. Расскажите, что вы знаете об угольных пластах (рис. 3 и 4). В своем рассказе дайте ответы на следующие вопросы:

1. What do Figures 3 and 4 show?

2. What figure shows the seam which consists only of coal
bands?

3. Is the coal seam (Fig. 3) horizontal or inclined?

4. Is the shape of the seam typical of igneous rocks or sedimen­
tary rocks? What do you know about the structure of sedimentary
rocks?

5. Can you explain why the coal seam shown in Fig. 4 is called
complex? What does the seam consist of?

6. What mineral substances may separate coal beds? What do we
call them?

7. What is thicker, coal bands or rock partings?