主旨題分類：
一般來講，主旨題主要考察學生的宏觀把握能力。通常分為標題題、目的性主旨題、變相主旨題與寫法性主旨題四種。
主旨題常見問法：
The primary purpose of the passage is to
The author is primarily concerned with
Which of the following best states the central idea of the passage?
best describes the organization of
Which of the following is the most accurate description of the organization of?
In developing the main idea of the passage, the author dose which of the following?
Which of the following is the most appropriate title for the passage?
The passage would be most likely to appear as a part of
解題思路：
解決主旨題有兩大思路：從文章入手和從題目選項入手。
a) 從文章入手指的是著重分析文章段落的首句，因為往往正確選項都是TS的改寫。分析的時候有一點要注意的，那就是TS並不絕對是每段的最後一句話，而有可能是文章的第二句甚至是第三句話。
Example：
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.
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.
A hypothesis is advanced, and supporting evidence is supplied.
分析：作者在文章的第一句話中就提出了自己的觀點：Because of its accuracy in outlining the Earths subsurface, the seismic-reflection method remains the most important tool in the search for petroleum reserves.在理解了這句話後，我們排查五個選項，發現C選項是唯一對TS的解釋，所以是正確選項。
b)從題目選項入手指的是重點分析5個待選的選項，對於主旨題來說，正確的選項都是對於文章的概括或者是對於背景的交代，所以我們可以大膽地剔除那些包含具體事物描述或敘述的選項。但是需要強調的是，這思路並不能保證我們做對每一道主旨題，而是能夠加快我們解題速度的一種方法。因此就不再舉例說明了。
總的說來，主旨題是GRE閱讀各類題目中最簡單的一種題型了，只要能夠很好地理解段落的Topic Sentence並能準確把握段落大意，一般這類題目的分數都能夠得到。
一般來講，主旨題主要考察學生的宏觀把握能力。通常分為標題題、目的性主旨題、變相主旨題與寫法性主旨題四種。
主旨題常見問法：
The primary purpose of the passage is to
The author is primarily concerned with
Which of the following best states the central idea of the passage?
best describes the organization of
Which of the following is the most accurate description of the organization of?
In developing the main idea of the passage, the author dose which of the following?
Which of the following is the most appropriate title for the passage?
The passage would be most likely to appear as a part of
解題思路：
解決主旨題有兩大思路：從文章入手和從題目選項入手。
a) 從文章入手指的是著重分析文章段落的首句，因為往往正確選項都是TS的改寫。分析的時候有一點要注意的，那就是TS並不絕對是每段的最後一句話，而有可能是文章的第二句甚至是第三句話。
Example：
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.
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.
A hypothesis is advanced, and supporting evidence is supplied.
分析：作者在文章的第一句話中就提出了自己的觀點：Because of its accuracy in outlining the Earths subsurface, the seismic-reflection method remains the most important tool in the search for petroleum reserves.在理解了這句話後，我們排查五個選項，發現C選項是唯一對TS的解釋，所以是正確選項。
b)從題目選項入手指的是重點分析5個待選的選項，對於主旨題來說，正確的選項都是對於文章的概括或者是對於背景的交代，所以我們可以大膽地剔除那些包含具體事物描述或敘述的選項。但是需要強調的是，這思路並不能保證我們做對每一道主旨題，而是能夠加快我們解題速度的一種方法。因此就不再舉例說明了。
總的說來，主旨題是GRE閱讀各類題目中最簡單的一種題型了，只要能夠很好地理解段落的Topic Sentence並能準確把握段落大意，一般這類題目的分數都能夠得到。
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