其实在GMAT备考过程中，很多同学对于逻辑部分的复习，并不知道该如何来进行复习，也不知道应该如何提分。今天我们就从官方指南出分，从指南中的题目解析考试，帮助大家对逻辑考试有更好的认识。
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GMAT OG逻辑题目解析第十题
Only a reduction of 10 percent in the number of scheduled flights using Greentown’s airport will allow the delays that are so common there to be avoided. Hevelia airstrip, 40 miles away, would, if upgraded and expanded, be an attractive alternative for fully 20 percent of the passengers using Greentown airport. Nevertheless, experts reject the claim that turning Hevelia into a full-service airport would end the chronic delays at Greentown.
只有减少G现有飞行计划的10%，才能避免现在G普遍存在的飞机延迟。如果把40英里外的H飞机跑道 进行升级和扩建，那么就会吸引整整20%的坐G的飞机的人。然而，专家却拒绝了这个宣称将H变成以通用飞机场会结束G的飞机习惯性延迟的提案。
Which of the following, if true, most helps to justify the experts’ position?
以下哪一项，如果成立的话，将可以使得专家的观点成立?
(A) Turning Hevelia into a full-service airport would require not only substantial construction at the airport itself, but also the construction of new access highways.
将H变成通用机场不仅要求对机场本省进行大量的建设，而且要求修建很多高速公路。
(B) A second largely undeveloped airstrip close to Greentown airport would be a more attractive alternative than Hevelia for many passengers who now use Greentown.
紧邻G机场的第二大未开发的跑道比G更家的具有吸引力，对G的现有乘客来说。
(C) Hevelia airstrip lies in a relatively undeveloped area but would, if it became a full-service airport, be a magnet for commercial and residential development.
H跑道位于一个相对未开发的地区，但是如果变成通用机场之后，将会变成一个吸引商业和住户的开发区。
(D) If an airplane has to wait to land, the extra jet fuel required adds significantly to the airline’s costs.
如果一个飞机正在等待降落的话，多余的燃料极大地增加了机场的花费。
(E) Several airlines use Greentown as a regional hub, so that most flights landing at Greentown have many passengers who then take different flights to reach their final destinations.
几个航线将G当做一个中继站，所以大部分在G降落的飞机的很多乘客会乘坐不同的飞机去往各自的目的地。
解析：这是一道加强题，加强专家的观点，将H变成通用飞机场并不能够减少延迟。
A 与飞机延迟无关，无关选项。
B 另外一个跑道和H跑道无关，无关选项。
C 这是说明修建通用跑道的好处，跟延迟无关，无关选项。
D 这是说明延迟的坏处，并不能说明修建能不能改善延迟现象。
E 如果很多航线在这降落还要换成很多不同的飞机的话，说明要求的飞机量更大，那么变成通用机场很有可能并不能改善现有的延迟现象。正确答案。
GMAT OG逻辑题目解析第十一题
The tulu, a popular ornamental plant, does not reproduce naturally, and is only bred and sold by specialized horticultural companies. Unfortunately, the tulu is easily devastated by a contagious fungal rot. The government ministry plans to reassure worried gardeners by requiring all tulu plants to be tested for rot before being sold. However, infected plants less than 30 weeks old have generally not built up enough fungal rot in their systems to be detected reliably. And many tulu plants are sold before they are 24 weeks old.
T是一种很受欢迎的观赏类植物，并且那只能在特殊的园艺公司培植并销售。不幸的是，T非常容易接触到真菌并腐烂毁掉。政府内阁打算要求所有的T在出售 之前都要经过真菌测试，以使花匠安心。然而，被感染的植物在30周内并没有形成足以让系统检测出来的真菌量。而很多T都是在24周的时候就被卖出了。
Which of the following, if performed by the government ministry, could logically be expected to overcome the problem with their plan to test for the fungal rot?
以下哪一项，如果被政府内科实行的话，将会克服这个测试真菌腐烂的 问题?
(A) Releasing a general announcement that tulu plants less than 30 weeks old cannot be effectively tested for fungal rot
放出公告说少于30州的T不能有效地被测试出真菌。
(B) Requiring all tulu plants less than 30 weeks old to be labeled as such
要求所有少于30周的T就照本身标签
(C) Researching possible ways to test tulu plants less than 24 weeks old for fungal rot
研究一种可行的方法检测出少于24周的T中的真菌
(D) Ensuring that tulu plants not be sold before they are 30 weeks old
确保在他们满30周以前不要出售
(E) Quarantining all tulu plants from horticultural companies at which any case of fungal rot has been detected until those tulu plants can be tested for fungal rot
当一个园艺公司检测出出来真菌后，隔离所有园艺公司的T直到可以被检测出真菌。
解析：这是一个加强题，结论在问题当中，加强政府实行那个政策的确可以达到目的的选项，一定要结合文章中政府的计划。
A 并不能够有效地解决那个计划中的问题，无关选项。
B 标签并不能够解决问题，无关选项。
C 违反文章事实性前提，文章说24周的T就是检测不出真菌。
D 如果确保在30周之前不要卖出的话，就可以在30周的时候检测出真菌，从而克服了政府计划的问题。正确答案
E 无法克服文章中计划的困难，这是另外一个计划。
GMAT OG逻辑题目解析第十二题
Although the number of large artificial satellites orbiting the Earth is small compared to the number of small pieces of debris in orbit, the large satellites interfere more seriously with telescope observations because of the strong reflection they produce. Because many of those large satellites have ceased to function, the proposal has recently been made to eliminate interference from nonfunctioning satellites by exploding them in space. This proposal, however, is ill conceived, since .
虽然与环绕地球轨道上的小块碎片的数目相比，环绕地球运转的大型人造卫星的数目小，但是大型卫星对于望远镜观测的干扰更严重，因为他们产生强烈的反射。因为许多这样的大型卫星已经停止运作，最近有建议提出将这些没有运作的大型卫星炸掉，以消除对于观测的干扰。然而这个建议是拙劣的，因为。
(A) many nonfunctioning satellites remain in orbit for years
(B) for satellites that have ceased to function, repairing them while they are in orbit would be prohibitively expensive
(C) there are no known previous instances of satellites’ having been exploded on purpose
(D) the only way to make telescope observations without any interference from debris in orbit is to use telescope launched into extremely high orbits around the Earth
(E) a great increased number of small particles in Earth’s orbit would result in a blanket of reflections that would make certain valuable telescope observations impossible
(A) 许多没有运作的卫星还持续在环绕地球的轨道上运转很多年
(B) 对于已经停止运作的卫星来说，在它们还在轨道上的时候对其进行修理是非常昂贵的
(C) 没有已知的将卫星故意炸掉的先例
(D) 想要进行没有任何来自轨道上碎片的干扰的望远镜观测的唯一方法是使用被发射到非常高的围绕地球轨道的望远镜
(E) 地球轨道中大量的小碎片会导致成群的反射现象，继而让获得任何有价值的望远镜观测变得不可能
解析：
A选项让炸掉卫星的政策更合理，与文章观点相反。不运作的卫星呆在轨道上不离开，又对观测有影响，就需要炸掉。
B选项同上。修理成本太高，难以负担，还不如炸掉。
C选项没有对文章结论起到支持作用。没有先例不能说明不该炸掉卫星。
D选项说明有其他方式排除观测干扰，但是不能说明炸掉卫星的建议不合理，炸掉卫星也能起到排除干扰的作用。
E选项正确。直接说明炸掉卫星带来的小碎片可能对观测产生更严重的干扰，也就体现出为了排除干扰炸掉卫星是不合理的，不能达到期望的效果，反而更糟。