对于备考GMAT的考试小白来说，使用备考指南是入门的必备资料。通过GMAT官方备考指南，可以加深我们对考试的认识，迅速帮助考生入门。但是对于GMAT指南中的一些题目，大家并不是很清楚具体的题目答案，因此小编在这里整理了一些题目的解析，供大家进行参考。
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GMAT OG逻辑题目解析第一题
Snowmaking machines work by spraying a mist that freezes immediately on contact with cold air. Because the sudden freezing kills bacteria, QuickFreeze is planning to market a wastewater purification system that works on the same principle. The process works only when temperature are cold, however, so municipalities using it will need to maintain a conventional system.
造雪机通过喷撒一层接触到冷空气后立即凝固的薄雾来运作，这种突然的水汽凝固可以杀灭细菌。QF 公司计划销售一种基于这种原理的废水净化系统 。但是由于这种灭菌过程只能在低温下运作，所以运用这种系统的市政机关还是需要维持传统的净化系统。
Which of the following, if true, provides the strongest grounds for a prediction that municipalities will buy QuickFreeze’s purification system despite the need to maintain a conventional purification system as well?
下列哪一项为真时能为这一预计提供最强的支持：尽管市政机关也需要维持传统的净化系统，但它们还是会购买QF公司生产的净化系统?
A. Bacteria are not the only impurities that must be removed from wastewater.
细菌不是唯一需要从废水中去除的污物。
B. Many municipalities have old wastewater purification systems that need to be replaced
很多市政原有的旧废水净化系统需要更新。
C. Conventional wastewater purification systems have not been fully successful in killing bacteria at cold temperatures.
传统的废水净化系统在低温下并不能完全成功地杀灭细菌。
D. During times of warm weather, when it is not in use, QuickFreeze’s purification system requires relatively little maintenance.
天气暖和，QF废水净化系统不使用的时候几乎不需要保养维护。
E. Places where the winters are cold rarely have a problem of water shortage.
有寒冬的地方几乎没有水源稀缺问题。
解析：
A. 选项的内容在原文中没有提到，没有说明 QF公司的废水净化系统除了杀灭细菌之外的作用。同时可能暗示，如果不能去除其他污物，净化效果可能欠佳，影响购买需求。反而起到削弱的效果，降低市政机关购买此净化系统的可能性。
B. 选项没有直接说明购买QF公司的废水净化系统原因，市政机关也可以买其他的系统来替代。
C. 选项特别说明了购买QF公司的废水净化系统的原因，因为它在低温下也能有效运作，提高了市政机关购买这一系统的可能性。
D. 选项中内容降低了维护成本，使市政更有可能购买这一系统。但是没有说明在低温下工作时的维护成本。
E. 选项的内容跟文章讨论的问题无关。
GMAT OG逻辑题目解析第二题
Suncrop, a new corporation with limited funds, has been clearing large sections of the tropical Amazon forest for cattle ranching. This practice continues even though greater profits can be made from rubber tapping, which does not destroy the forest, than from cattle ranching, which does destroy the forest.
Suncrop，一个新的资金有限的公司，清理了一大块亚马逊热带雨林的地方用于经营畜牧业。这一行为在继续，尽管更大的利润可以被获得通过开发橡胶，该方式不损害雨林，而畜牧业损害雨林。
Which of the following, if true, most helps to explain why Suncrop has been pursuing the less profitable of the two economic activities mentioned above?
下列哪个选项如果正确，最有效地解释了为什么Suncrop选择上述两个经济活动中获利更少的那个?
A. The soil of the Amazon forest is very rich in nutrients that are important in the development of grazing lands.
亚马逊雨林的土地有利于牧草草场的生长的营养丰富。
B. Cattle-ranching operations that are located in tropical climates are more profitable than cattle-ranching operations that are located in cold-weather climates.
热带气候区的畜牧业公司比寒冷气候地区的畜牧业公司更盈利。
C. In certain districts, profits made from cattle ranching are more heavily taxed than profits made from any other industry.
在某些地区，畜牧业获利的税收比其他工业更重。
D. Some of the cattle that are raised on land cleared in the Amazon are killed by wildcats.
一些牛被野猫杀死了。
E. The amount of money required to begin a rubber tapping operation is twice as high as the amount needed to begin a cattle ranch.
开始橡胶开发作业的初始资金需求是开始畜牧业的两倍。
解析：
A. 易错项。选项确实给了个理由在解释为什么畜牧业有利可图，但是文章说得很明白，橡胶开发的利润是大于畜牧业的，不能解释为什么选择利润相对少的畜牧业。
(要解释的不是为什么开发畜牧业，而是为什么和利润更高的橡胶开发业相比，还是要选择开发畜牧业)
B. 文章只关心热带地区公司，和寒冷地区公司不相关，选项里的比较没有意义。
C.畜牧业税收重，更不应该选择畜牧业，不能解释为什么选择。
D.牛被野猫杀死，那畜牧业应该利润更小。和C一样，说反了，不能解释。
E.正确答案。启动资金少，所以选择畜牧业，尽管它的利润少。而且文章说的很清楚，这个公司资金是有限的。所以很可能没有足够多的资金用于建立橡胶开发。
思路：解释题文章中出现比较，选项中往往出现相关比较。
GMAT OG逻辑题目解析第三题
Parland’s alligator population has been declining in recent years, primarily because of hunting. Alligators prey heavily on a species of freshwater fish that is highly valued as food by Parilanders, who had hoped that the decline in the alligator population would lead to an increase in the numbers of these fish available for human consumption. Yet the population of this fish has also declined, even though the annual number caught for human consumption has not increased.
P地区的短吻鳄数量近些年下降，主要原因是捕猎。短吻鳄捕食的淡水鱼是P居民的食物，P居民希望短吻鳄数量的下降可以导致这种可供人们消费的鱼的数量上升。但是这种鱼的数量也下降了，尽管它每年被人类抓住消费的的量没有增加。
Which of following, if true, most help to explain the decline in the population of the fish species?
下列哪个选项如果是对的，最有效地解释了鱼的数量下降?
A. The decline in the alligator population has meant that fishers can work in some parts of lakes and rivers that were formerly too dangerous.
短吻鳄数量的下降意味着渔民可以到以前湖里和江河里那些以前很危险的地方工作。
B. Over the last few years, Parland’s commercial fishing enterprises have increased the number of fishing boats they use.
过去几年，P的渔业公司增加了它们使用的捕鱼船数量。
C. The main predator of these fish is another species of fish on which alligator also prey.
这种鱼的主要捕食者是另一种也被短吻鳄捕食的鱼
D. Many Parlanders who hunt alligators do so because of the high market price of alligator skins, not because of the threat alligators pose to the fish population.
许多居民捕猎短吻鳄是因为鳄鱼皮市场价格高，而不是因为它威胁到鱼的数量。
E. In several neighboring countries through which Parland’s rivers also flow, alligators are at risk of extinction as a result of extensive hunting.
在一些P河流经的邻近国家，短吻鳄有灭绝的危险因为捕猎。
解析：
A. 渔民在哪工作，不能解释为什么短吻鳄数量下降，淡水鱼的数量也下降。
B. 易错项。文章说得很清楚，人们消费捕食鱼的数量没有上升，所以即使增加了捕鱼船的数量，也不能说明鱼被捕的多，所以不能解释鱼的数量下降。
C. 正确答案。由于短吻鳄的数量减少，另一种该淡水鱼的捕食者数量就很可能增加，是它们捕食更多的淡水鱼，解释了为什么淡水鱼的数量减少。
D. 捕猎短吻鳄的原因，和文章要解释现象，即为什么鱼的数量下降无关。
E. 短吻鳄有灭绝风险，和文章要解释现象，即为什么鱼的数量下降无关。
思路：文章中出现上升下降，正确答案往往体现出变化。
变化：短吻鳄变少
相应变化：鱼的另一种捕食者数量变多