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带你解析GMAT CR难题，掌握高分秘诀！

相信大家在备考GMAT的时候，重点需要提高的也就是语文verbal部分的三大题型SC,CR,RC了,而在这三大题型里CR其实是最能考察大家逻辑思维能力的

所以在做CR的过程中一定要注意对核心影响关系的提取，提出的逻辑链尽量精练，不要拖泥带水，这样才有助于我们更好的结合问题看选项

但是还是会有很多的同学在做逻辑题时总是最后在两个选项中确定时选中错误的那个，或者是面对选项无从下手，那今天就由武汉申友GMAT的verna老师来给大家深入解析CR难题，希望对大家思维提升和对GMAT CR逻辑链的提取有所帮助

GMAT CR例题解析1   

1. In Mernia commercial fossil hunters often sell important fossils they have found, not to universities or museums, but to individual collectors, who pay much better but generally do not allow researchers access to their collections.To increase the number of fossils available for research, some legislators propose requiring all fossils that are found in Mernia to be sold only to universities or museums.

Which of the following, if true, most strongly indicates that the legislators’ proposal will fail to achieve its goal？

A. Some fossil hunters in Mernia are not commercial fossil hunters, but ratherare amateurs who keep the fossils that they find.

B. Most fossils found in Mernia are common types that have little scientific interest.

C. Commercial fossil hunters in Mernia currently sell some of the fossils they find to universities and museums.

D. Many universities in Mernia do not engage in fossil research.

E. Most fossils are found by commercial fossil hunters, and they would give up looking for fossils if they were no longer allowed to sell to individual collectors.

解析：

逻辑链：化石猎手把化石卖给----个人收藏家---而不是大学或博物馆

计划：增加化石数量

法规建议：M地发现化石-----只能卖给大学或者博物馆问削弱法规制定者。反着来，让化石数量不能增加即可。

A 一些M的化石猎手并不是做交易的，而仅仅是爱好者而已，喜欢保留他们自己找到的化石（some一些不能说明proposal没用，排除）

B 在M地大部分被发现的化石很常见，没有科学研究的吸引点（和常见的化石无关，因为文章有提到important　fossils，再者，和proposal无关，排除）

C　M地做交易的化石猎手最近把他们的化石卖给了大学或者博物馆（这是增强，排除）

D 很多M地的大学并没有参与到化石研究当中（和大学无关，排除）

E 很多化石是被做交易的化石猎手发现的，而且如果他们不允许把化石卖给个人收藏者的话他们就会放弃继续寻找化石。（他们不找化石的话，很多化石就不会被发现，可被研究的化石数目也不会增加，法规达不到目的，削弱，正确）

GMAT CR例题解析2  

2. Between 1980 and 2000 the sea otter population of the Aleutian Islands declined precipitously. There were no signs of disease or malnutrition, so there was probably an increase in the number of otters being eaten by predators. Orcas will eat otters when seals, their normal prey, are unavailable, and the Aleutian Islands seal population declined dramatically in the 1980s. Therefore, orcas were most likely the immediate cause of the otter population decline.

Which of the following, if true, most strengthens the argument?

A. The population of sea urchins, the main food of sea otters, has increased since the sea otter population declined.

B. Seals do not eat sea otters, nor do they compete with sea otters for food.

C. Most of the surviving sea otters live in a bay that is inaccessible to orcas.

D. The population of orcas in the Aleutian Islands has declined since the 1980s.

E. An increase in commercial fishing near the Aleutian Islands in the 1980s caused a slight decline in the population of the fish that seals use for food.

解析：

逻辑链：orcas最可能是otter数量下降的直接原因。

增强，也就是结论就是最后一句

A. otter的主要食物urchins的数量在otter数量下降后上升了；otter下降的影响，而不是其下降的原因，排

B. 海豹不吃otter,也不和otter抢食；这说得是海豹和otter可和平共处，无法增强结论

C. 大部分幸存otter生活在orcas到不了的海湾；说明orcas能到的地方otter都被吃了，搭桥增强，正确。此题里提到的seals本质是没有任何影响的，不用去纠结原文seals的影响，是干扰你的一个插曲，找准orcas和sea otters的关系就对了。

D. A岛的orcas数量在从1980年代起下降了；orcas和otter同时下降，说明海豹的下降可能不是因为orcas的捕食，方向反，排

E. 1980年代临近A岛商业捕鱼上升，导致海豹吃的鱼数量下降了一点；本质无关，吃鱼的数量下降久下降了，又怎么样呢?对otters数量是没有影响的，只是在陈述海报的情况，排除

GMAT CR例题解析3   

3. Many people suffer an allergic reaction to certain sulfites, including those that are commonly added to wine as preservatives. However, since there are several winemakers who add sulfites to none of the wines they produce, people who would like to drink wine but are allergic to sulfites can drink wines produced by these winemakers without risking an allergic reaction to sulfites.

Which of the following is an assumption on which the argument depends?

A.These winemakers have been able to duplicate the preservative effect produced by adding sulfites by means that do not involve adding any potentially allergenic substances to their wine.

B.Not all forms of sulfite are equally likely to produce the allergic reaction.

C.Wine is the only beverage to which sulfites are commonly added.

D.Apart from sulfites, there are no substances commonly present in wine that give rise to an allergic reaction.

E.Sulfites are not naturally present in the wines produced by these winemakers in amounts large enough to produce an allergic reaction in someone who drinks these wines.

解析：

逻辑链：酿酒的人不添加sulfites,----喝酒的人就不会对sulfies 过敏

假设题，必须与S相关

A. 这些制酒者可以用不添加过敏物质的方式达到添加S相同的防腐效果；其他方式的防腐效果，无关

B. 不是所有形式的S产生过敏反应的可能性一样；可能性这个点不在探讨范围内，排

C. 酒是唯一S被普遍添加的饮料；only, 绝对选项，排

D. 除了S外，没有其他物质引起过敏反应；除S外其他物种，本质是跳出范畴，因为就算没有其他物质引起过敏反应，也不是逻辑链里强调的重点，所以另提一个其他物质是多余的，排除

E. S不是天然存在这些制酒者酒中，数量上大到可以引起过敏反应；搭桥增强，没有天然S影响导致过敏，不添加S这种因素才可起作用，导致不过敏。取反：如果天然存在那应该过敏阿，所以选E正确。

GMAT CR例题解析4  

4. The recent decline in the value of the dollar was triggered by a prediction of slower economic growth in the coming year. But that prediction would not have adversely affected the dollar had it not been for the government's huge budget deficit, which must therefore be decreased to prevent future currency declines.Which of the following, if true, would most seriously weaken the conclusion about how to prevent future currency declines?

A. The government has made little attempt to reduce the budget deficit.

B. The budget deficit has not caused a slowdown in economic growth.

C. The value of the dollar declined several times in the year prior to the recent prediction of slower economic growth.

D. Before there was a large budget deficit, predictions of slower economic growth frequently caused declines in the dollar's value.

E. When there is a large budget deficit, other events in addition to predictions of slower economic growth sometimes trigger declines in currency value. 

解析：

美元贬值引发来年经济放缓的预测。如果没有政府的巨大预算赤字，(对经济发展放缓的)预期就不会对美元贬值有影响，必须要削减政府的巨额预算赤字从而防止未来的货币贬值。  

逻辑链：预测---美元贬值

没有赤字，预测就不会对美元贬值有影响。（要把预测导致美元贬值看成一个整体）问削弱。

A. 政府对减少赤字做了很少尝试；attemp主观选项，排

B. 预算赤字没有导致经济增长缓慢；预算与经济增长的关系，是无关的，对象没找准，排

C. 在预测前一年美元已经贬值好几次了；以前发生的情况，跳出探讨范围，对现在影响无从判断，排

D. 在赤字发生前，经济放缓的预测经常导致货币贬值；说明赤字与预测无关，因此赤字也不能影响货币贬值，撇清关系削弱，正确。无论是否提到赤字，经济会放缓的预言都会导致美元贬值

E.当赤字发生时，其他事结合经济放缓有时导致货币贬值；其他事，跳出范围；sometimes，无意义概率，排

GMAT CR例题解析5   

5. Although the discount stores in Goreville's central shopping district are expected to close within five years as a result of competition from a Spendless discount department store that just opened, those locations will not stay vacant for long. In the five years since the opening of Colson's, a nondiscount department store, a new store has opened at the location of every store in the shopping district that closed because it could not compete with Colson's.Which of the following, if true, most seriously weakens the argument?

A. Many customers of Colson's are expected to do less shopping there than they did before the SpendLess store opened.

B. lncreasingly, the stores that have opened in the central shopping district since Colson's opened have been discount stores.

C. At present, the central shopping district has as many stores operating in it as it ever had.

D. Over the course of the next five years, it is expected that Goreville's population will grow at a faster rate than it has for the past several decades.

E.Many stores in the central shopping district sell types of merchandise that are not available at either SpendLess or Colson's.

解析：

逻辑链：G竞争不过S，打折S店出现→旁边的店倒闭→argument：倒闭店址也会有新店开（因为不会空太久)

不打折的C店出现→旁边的店倒闭→倒闭店址有新折扣店开

类比题，削弱就是找不同点

注意这句话是关键：those locations will not stay vacant for long.

A. 客户预计在C店的购物量预计要比S店开张前少。Expected， 主观，错。购物量不是重点，重点是开店的数量和店的性质。

B.在Ｃ附近开的店是打折店增多.削弱成功，削弱点应该从C店入手，一个是从数量上取胜，一个是从店的性质取胜，打折店增多，完美削弱。

C.目前，中央购物区经营的商店和以往一样多。店的数量与过去的数量对比，原文说新店会开张因为没竞争，无关

D.在接下来的五年里，预计Goreville的人口增长速度将超过过去几十年。人口增加，无关

E.中心店铺卖的东西在其他店里买不到，原文从头到尾都在谈论倒闭的问题，没说到过卖什么东西的问题，无关

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