gre考试阅读真题解析(A)_GRE阅读

gre考试阅读真题解析(A)

　　 presence of unrelated wave trains

　　 placement of the seismic instruments

　　 number of sources in the grid pattern

　　 nature of the reflectivity of the rock interfaces

　　 properties of rocks through which the wave train has traveled

　　19. It can be inferred from the passage that the seismic-reflection method would be likely to yield an inaccurate physical profile of the subsurface in which of the following circumstances?

　　 If the speed at which the wave train moved downward changed

　　 If the receiver were not positioned directly at the wave-train source

　　 If the rock on one side of a rock interface had similar elastic characteristics to those of the rock on the other side

　　 If the seismic records obtained for the different sources in a grid were highly similar to each other

　　 If there were no petroleum deposits beneath the area defined by the grid of wave-train sources

　　20. Which of the following best describes the organization of the passage?

　　 A method is criticized, and an alternative is suggested.

　　 An illustration is examined, and some errors are exposed.

　　 An assertion is made, and a procedure is outlined.

　　 A series of examples is presented, and a conclusion is drawn.

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