[单项选择]　　Petroleum products, such as gasoline, kerosine, home heating oil, residual fuel oil, and lubricating oil, all come from one source ― crude oil found below the earth’’ s surface, as well as under large bodies of water, from a few hundred feet below the surface to as deep as 25 000 feet into the earth’’s interior. Sometimes crude oil is secured by drilling a hole through the earth, but more dry holes are drilled than those generating oil. Pressure at the source or pumping forces crude oil to the surface. 　　Crude oil wells flow at varying rates, from ten to thousands of barrels per. hour. Petroleum products are always measured in 42-gallon barrels. 　　Petroleum products are different in physical appearance: thin, thick, transparent or opaque, but their chemical composition is made up of only two elements: carbon and hydrogen, which form compounds called hydrocarbons. Other chemical elements found in union with the hydrocarbons are few and are classified as impurities. Trace elements ar
A. Gasoline.
B. Kerosine.
C. Distillate oil.
D. Diesel oil.

[单项选择]　　Petroleum products, such as gasoline, kerosine, home heating oil, residual fuel oil, and lubricating oil, all come from one source ― crude oil found below the earth’’ s surface, as well as under large bodies of water, from a few hundred feet below the surface to as deep as 25 000 feet into the earth’’s interior. Sometimes crude oil is secured by drilling a hole through the earth, but more dry holes are drilled than those generating oil. Pressure at the source or pumping forces crude oil to the surface. 　　Crude oil wells flow at varying rates, from ten to thousands of barrels per. hour. Petroleum products are always measured in 42-gallon barrels. 　　Petroleum products are different in physical appearance: thin, thick, transparent or opaque, but their chemical composition is made up of only two elements: carbon and hydrogen, which form compounds called hydrocarbons. Other chemical elements found in union with the hydrocarbons are few and are classified as impurities. Trace elements ar
A. Crude oil is found below land and water.
B. Crude oil is always found a few hundred feet below the surface.
C. Pumping and pressure force crude oil to the surface.
D. A variety of petroleum products is obtained from crude oil.

[简答题]Finally, oil and other petroleum products that are spilled into bodies of water foul beaches and kill sea birds and mammals, such as dolphins and whales.

[填空题]Many petroleum products can _____ as raw materials for the chemical industry.

[单项选择]
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