四级冲刺练习阅读164_大学英语阅读_大学英语-查字典英语网

　　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.

　　27. Many thousands of hydrocarbon compounds are possible because_______.

　　A. the petroleum products vary greatly in physical appearance

　　B. complicated refining processes rearrange the chemical structure

　　C. the two atoms in the molecule assume many positions

　　D. the pressure needed to force it to the surface causes molecular transformation

　　28. Which of the following is TRUE?

　　A. The various petroleum products are produced by filtration.

　　B. Heating and condensation produce the various products.

　　C. Chemical separation is used to produce the various products.

　　D. Mechanical means such as the centrifuge are used to produce the various products.

　　29. Crude oil is brought to the surface by_______.

　　A. expansion of the hydrocarbons

　　B. pressure and pumping

　　C. vacuum created in the drilling pipe

　　D. expansion and contraction of the earths surface

　　30. Which of the following is not listed as a light oil?

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