GRE Text Completion Question 359

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Source: XDF

Currently, pumps that could boost the natural pressure sufficiently to drive the crude through a pipeline to the shore do not work (i)_____because of the crude's content. Crude may consist of oil or natural gas in (ii)_____states—combinations of liquids, gases, and solids under pressure—that do not reach the wellhead in (iii)_____proportions. The flow of crude oil, for example, can change quickly from 60 percent liquid to 70 percent gas.

A consistently D monotonous G constant
B simultaneously E multiphase H different
C successively F derivative I derivative

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