explanations of how animals migrate tend to replace, rather than build on, one another
这种题做题步骤:1. 找TS, 2. 简单浏览一下整个文章 3. 找对TS句的同义替换的句子.按照这样的步骤看第一句话A mysterious phenomenon is the ability of over-water migrants to travel on course. 一个神奇的现象时越水迁徙的动物为什么能一直保持在准确的航线上呢? 原因是.. 不难通过排除法很快的选出B 为正确选项。
我们再来看一道结构型的主旨题:
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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