阅读36套section 17一篇阅读结构求指点

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Volcanic rock that forms as fluid lava chills rapidly is            
called pillow lava. This rapid chilling occurs when lava erupts           
directly into water (or beneath ice) or when it flows across a            
shoreline and into a body of water. While the term ―pillow lava‖           
suggests a definite shape, in fact geologists disagree. Some               
geologists argue that pillow lava is characterized by discrete,                  
ellipsoidal masses. Others describe pillow lava as a tangled              
mass of cylindrical, interconnected flow lobes. Much of this
controversy probably results from unwarranted extrapolations            
of the original configuration of pillow flows from two-                  
dimensional cross sections of eroded pillows in land                     
outcroppings. Virtually any cross section cut through a tangled            
mass of interconnected flow lobes would give the appearance               
of a pile of discrete ellipsoidal masses. Adequate three-                 
dimensional images of intact pillows are essential for defining         
the true geometry of pillowed flows and thus ascertaining their           
mode of origin. Indeed, the term ―"pillow",itself suggestive of                                                                              
discrete masses, is probably a misnomer.

这是36套里面section17的第一篇阅读，当时做的时候就感觉对文章理解的不好，这篇后面的三道题就对了一道，后来仔细看了看还是不太理解这篇文章的结构，所以请大家帮忙一起来讨论讨论这篇的结构啦，非常感谢~~~

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huangtan 发表于 2013-8-18 15:28
希望对你有帮助

谢谢！！这样一来就清楚多了只是我也觉得在文章最后作者否定了第一种观点，那为什么这道题
1. In the passage, the author is primarily interested in
(A) analyzing the source of a scientific controversy
(B) criticizing some geologists‘ methodology
(C) pointing out the flaws in a geological study
(D) proposing a new theory to explain existing
scientific evidence
(E) describing a physical phenomenon
While the term “pillow lava”
选的是A而不是C呢，不是最后指出观点的缺陷了吗？

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huangtan 发表于 2013-8-18 15:41
你看这篇文章大绝大篇幅在干嘛？？---首先介绍背景，引出controversy，然后说controversy产生的原因（并且 ...

啊啊~这下彻底醒悟了~之前看了好多解析就是想不通，太感谢啦！

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reiraless 发表于 2013-8-18 15:46
因为作者最后下的不是一个结论 probably  整个过程还是分析 然后表面自己的一种倾向 ...

明白啦~还是要从全文把握的说。。。我之前目光狭隘了~