好，进入正题。在单选题五个选项中错误的那四个选项怎么也逃不过这四个特点“混!偏!反!无!”有时候每个错误选项都能对应其中一个，有时候对应两到三个。
“混”，要么是“张冠李戴”，就是把a做的事或说的话放到b的头上(这个雅思和
“偏”，说出来的话没有错，但只说了一部分，或者没抓住最重点，主旨题中常考。这个考点考的是长难句的分析，在分析了长难句后必须划分的出主干及各成分，才抓的住核心;此外，主旨题还有个原则，叫“从前不从后”，当文章太长，被划分多个段落，每个段落都出现新事物的时候，以最先出现的新事物(名词短语)为住，剩下的为辅。
“反”，这个理解起来很清晰，YES&NO说反了。但做起来不一定简单，注意选项和文章考点中的语法，多重转折、多重否定及语言顺序。以及逻辑题特别是改善题中的一定要取反时别把自己绕进去了。此外，文章和选项中不一定傻傻得出“YES”/”NO”，很可能给出得是一对逻辑相反的动词或者形容词或者副词，比如，rescind和embrace,所以你的词汇量在哪里呢?
“无”，最清楚不过了，就是原文压根没提到。但是，这个找起来最花时间对不对，因为找不到所以找了好久啊，坑人的选项!短文章还好，长文章的话对自己语言动地不自信的孩子还是别完全依赖排除法，找到正确选项最保险。我做过的最坑人的一道GMAT阅读，五个选项中有三个是NOT GIVEN，找得心累!
好的，下面上真题，这题是半年内的新题，文章和题目超级典型，选项逻辑也很缜密;
The decrease in responsiveness
The decrease in responsiveness that follows continuous stimulation (adaptation) is common to all sensory systems, including olfaction. With continued exposure to chronically present ambient odors, individuals’ perception of odor intensity is greatly reduced. Moreover, these perceptual changes can be profound and durable. It is commonly reported that following extended absences from the odorous environment, reexposure may still fail to elicit perception at the original intensity.
Most research on olfactory adaptation examines relatively transient changes in stimulus detection or perceived intensity—rarely exceeding several hours and often less—but because olfactory adaptation can be produced with relatively short exposures, these durations are sufficient for investigating many parameters of the phenomenon. However, exposures to odors in natural environments often occur over far longer periods, and the resulting adaptations may differ qualitatively from short-term olfactory adaptation. For example, studies show that even brief periods of odorant stimulation produce transient reductions in receptors in the olfactory epithelium, a process termed “receptor fatigue.” Prolonged odor stimulation, however, could produce more long-lasting reductions in response, possibly involving structures higher in the central nervous system pathway.
The passage asserts which of the following about the exposures involved in the “research on olfactory adaptation”?
A. The exposures are of long enough duration for researchers to investigate many aspects of olfactory adaptation.
B. The exposures have rarely consisted of reexposures following extended absences from the odorous environment.
C. The exposures are intended to reproduce the relatively transient olfactory changes typical of exposures to odors in natural environments.
D. Those exposures of relatively short duration are often insufficient to produce the phenomenon of receptor fatigue in study subjects.
E. Those exposures lasting several hours produce reductions in receptors in the olfactory epithelium that are similar to the reductions caused by prolonged odor stimulation.
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