All of the following are stated by the author as problems connected with the sources for knowledge of pre modern cultures EXCEPT
Partial completeness
Restricted accessibility
Difficulty of interpretation
Limited quantity
Tendency toward contradiction
在读上述题干时,我们首先需要明确题目所涉及的核心事物为source与pre modern cultures, 之后通过回归定位法进入第一遍阅读时,找到有关source 与pre modern cultures出现的位置,文章黑斜体出现处,即是source的出现位置,其实source后面所出现的几个特征描述分别是选项,A,C,D,E的改写,接下来利用排除法,我们便能找出B为正确答案。
2、定位TS
不管GRE阅读文章看起来多么支离破碎,千奇百怪,都会始终贯穿一个思想,一条主线,作者往往也会通过一句话或两句话的方式阐述其所关注的焦点及对象,我们既可以将之称为文章的中心思想,也可以称之为TS,TS对于从宏观角度把握整篇文章的结构以及领会文章的前后所指起到非常大的作用,抓住了TS句也就找到了文章的主脉络。TS的出现位置根据文章的结构也会有所不同,但大体上会出现上三处:文章开头,文章中间和文章结尾。
Because of its accuracy in outlining the Earths subsurface, the seismic-reflection method remains the most important tool in the search for petroleum reserves. In field practice, a subsurface is mapped by arranging a series of wave-train sources, such as small dynamite explosions, in a grid pattern. As each source is activated, it generates a wave train that moves downward at a speed determined uniquely by the rocks elastic characteristics. As rock interfaces are crossed, the elastic characteristics encountered generally change abruptly, which causes part of the energy to be reflected back to the surface, where it is recorded by seismic instruments. The seismic records must be processed to correct for positional differences between the source and the receiver, for unrelated wave trains, and for multiple reflections from the rock interfaces. Then the data acquired at each of the specific source locations are combined to generate a physical profile of the subsurface, which can eventually be used to select targets for drilling.
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