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.

　　 A hypothesis is advanced, and supporting evidence is supplied.

　　分析：

　　因为这篇文章属于结论说明型文章，作者在首句就提出了结论，即Because of its accuracy in outlining the Earths subsurface, the seismic-reflection method remains the most important tool in the search for petroleum reserves. 这也正是全文的中心句。后面是对作者结论的解释说明，所以C选项是最合适的。

　　3. 其他主旨题

　　其他类型的主旨题出现频率相对较低，但是也相对容易些，可总结的规律较多。如：

　　a. 针对文章题目提问。

　　常见的提问方式：

　　Which of the following titles best summarizes the content of the passage?

　　b. 针对段落大意、段落作用提问。

　　常见的提问方式：

　　Which of the following statements would most logically conclude the last paragraph of the passage?

　　Which of the following best describes the relationship of the first paragraph of the passage as a whole?

　　In the third paragraph, the author is primarily concerned with

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