1. The purpose of lubrication is to reduce friction.
2. Mineral oil became very important only when the oil wells were found in Pennsylvania.
3. Vegetable oil was unknown in ancient times.
4. The passage gives a general description of 3 main types of oils.
5. The Middle East is one of the four main areas of the world where deposits of oil appear.
6. On the Island of Trinidad, drilling is not necessary to obtain oil.
7. Whales are the largest animals now living in the world.
8. Scientists think that oil was formed from ______in the sea.
9. The cost of unsuccessful drilling is included in ______of petrol.
10. The driller is unlucky when the drill goes very near oil without ______it.
答案:1. Y 2. N 3. N 4. N 5. NG 6. Y 7. Y 8. living things 9. the selling price 10. striking
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