Passage Reading and English Comprehension

Often the oil contains natural gas. It is dissolved in the oil because of the high pressure deep underground. When the drill penetrates the oil-bearing layer this pressure is released. It provides a tremendous thrust and may be sufficient to bring all the oil to the surface. If the gas pressure is not sufficient a pumping station must be built to bring up the oil. This increases the cost of the drilling operation. In its natural 'crude' state oil consists of a mixture of various substances called hydrocarbons. These substances must be separated according to their densities, and purified. This process is called refining.

1209. It is clear in the passage that

	(a) hydrocarbons are the constituents of natural gas
	(b) refining is the process of separating natural gas and oil from each other
	(c) when the oil is brought to the surface, it's in a raw state
	(d) substances should be separated from natural gas

1210. Oil

	(a) is the remnants of the pre-historic plants and animals
	(b) may be brought to the surface in a natural way
	(c) contains not only natural gas, but also some other constituents
	(d) which is mixed with natural gas is more expensive than the crude one

1211. It could be drawn out of the passage that

	(a) natural gas in oil makes it easier to drill
	(b) refining is the act of keeping oil and natural gas under pressure
	(c) as soon as the pumping station is founded upon the base, distilling starts
	(d) crude oil is mixed with only natural gas

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Detailed Solution

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