13版OG逻辑部分分析------by 北京新东方GMAT项目组 13th 官方指南上的Critical Reasoning部分和12th 官方指南对应部分相比较而言，总体难度保持一致，但是文章给出的信息有变多、变复杂的趋势，文章的主要结论获取难度也有所增加。但没有新题型出现。其中13th 中替换了原来的25道旧题，新题号分别是： 1, 3, 6, 8, 9, 11, 12, 17, 19, 22, 29, 33, 39, 49, 59, 65, 69,74, 81, 86, 94, 100, 106, 114, 124
削弱题: 8, 100
假设题: 106
评价题: 114, 124
加强题: 1, 11, 19, 29
解释题: 3, 6, 9, 17, 22, 49, 86, 94
填空题: 12, 33, 39, 59, 65, 69, 74, 81
结合近期几次考试的经验，我们发现：
1，削弱题部分增加了Flaw题的考查，需要我们对文章的论证过程理解更加深刻，提炼更加精确，某种程度上增加了一定的难度。
2，假设题部分做题思路并没有改变，依然采用寻找否定句的方式进行。
3，评价题和加强题部分变化也不明显，需要认真考查文章的架构和选项的作用
4，考试中遇到更多解释题和填空题的可能性在变大，但填空题的文章结构变化不大，Argument和Fact set这两种文章结构各占一半左右，对于Argument文章来说填空题一般都是寻找加强项或者假设项，而Fact set文章一般都是寻找解释项，当成解释题来做。这两种题都属于CR中相对较容易的题。
[新题解析]
Snowmaking machines work by spraying a mistthat freezes immediately on contact with cold air. Because the sudden freezingkills bacteria, QuickFreeze is planning to market a wastewater purificationsystem that works on the same principle. The process works only whentemperature are cold, however, so municipalities using it will need to maintaina conventional system.
Which of the following, if true, provides thestrongest grounds for a prediction that municipalities will buy QuickFreeze’spurification system despite the need to maintain a conventional purificationsystem as well?
A. Bacteriaare not the only impurities that must be removed from wastewater.
B. Manymunicipalities have old wastewater purification systems that need to bereplaced
C. Conventionalwastewater purification systems have not been fully successful in killingbacteria at cold temperatures.
D. Duringtimes of warm weather, when it is not in use, QuickFreeze’s purification systemrequires relatively little maintenance.
E. Placeswhere the winters are cold rarely have a problem of water shortage.
Exposure to certain chemicals commonly usedin elementary schools as cleaners or pesticides causes allergic reactions insome children. Elementary school nurses in Renston report that the proportionof schoolchildren sent to them for treatment of allergic reactions to thosechemicals has increased significantly over the past ten years. Therefore,either Renston’s schoolchildren have been exposed to greater quantities of thechemicals, or they are more sensitive to them than schoolchildren were tenyears ago.
Which of the following is an assumption onwhich the argument depends?
(A)The number ofschool nurses employed by Renston’s elementary schools has not decreased over the past ten years.
(B)Children whoare allergic to the chemicals are no more likely than other children to haveallergies to other substances.
(C)Children whohave allergic reactions to the chemicals are not more likely to be sent to aschool nurse now than they were ten years ago.
(D)The chemicalsare not commonly used as cleaners or pesticides in houses and apartmentbuildings in Renston.
(E)Childrenattending elementary school do not make up a larger proportion of Renston’spopulation now than they did ten years ago.
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13版OG语法部分解析-转自XDF
13版OG阅读部分变化解析-转自XDF
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