主旨题分类:
一般来讲,主旨题主要考察学生的宏观把握能力。通常分为标题题、目的性主旨题、变相主旨题与写法性主旨题四种。
主旨题常见问法:
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
解题思路:
解决主旨题有两大思路:从文章入手和从题目选项入手。
a) 从文章入手指的是着重分析文章段落的首句,因为往往正确选项都是TS的改写。分析的时候有一点要注意的,那就是TS并不绝对是每段的最后一句话,而有可能是文章的第二句甚至是第三句话。
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.
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