其实在GMAT考试中，逻辑部分的考试难度也很大，大家想要在这部分中拿到高分，那么在平时的备考练习中，我们也需要投入更多的时间来备考。今天我们就从
例题1：
People who do regular volunteer work tend to live longer, on average, than people who do not. It has been found that “doing good,” a category that certainly includes volunteer work, releases endorphins, the brain’s natural opiates, which induce in people a feeling of well-being. Clearly, there is a connection: Regular releases of endorphins must in some way help to extend people’s lives.
Which of the following, if true, most seriously undermines the force of the evidence given as support for the hypothesis that endorphins promote longevity?
A. People who do regular volunteer work are only somewhat more likely than others to characterize the work they do for a living as “doing good.”
B. Although extremely high levels of endorphins could be harmful to health, such levels are never reached as a result of the natural release of endorphins.
C. There are many people who have done some volunteer work but who do not do such work regularly.
D. People tend not to become involved in regular volunteer work unless they are healthy and energetic to begin with.
E. Releases of endorphins are responsible for the sense of well-being experienced by many long-distance runners while running.
例题解析：
平均来说，有规律的义务工作的人往往活的更长。据发现，“做好事”包括义务工作，经常释放E 物质(内啡肽)，大脑的自然鸦片，使人感觉良好。显然，有这样一种关联：E 物质的规律释放在某种程度上肯定帮助延寿。
削弱题，削弱E 可延寿的假设的证据 A 规律义务工作的人比其他人只是稍微更可能把维生工作作为“做好事”;无关，排除。
B 尽管E 的极高水平可能对健康有害，自然释放E 的结果绝不会到达这样的水平;无关，排除。
C 很多做某种义务工作的人做这样的事不规律;无关，排
D 除非很健康，人们往往不会规律地义务工作;说明健康是义务工作的原因，削弱了义务工作导致健康，从而削弱了和义务工作相关联的E 物质导致了健康长 寿，正确
E. E 物质的释放导致很多长跑者跑步时有良好感觉;良好感觉，无关，排除。
例题2：
Although the school would receive financial benefits if it had soft drink vending machines in the cafeteria, we should not allow them. Allowing soft drink machines there would not be in our students’ interest. If our students start drinking more soft drinks, they will be less healthy. The argument depends on which of the following?
A. If the soft drink vending machines were placed in the cafeteria, students would consume more soft drinks as a result.
B. The amount of soft drinks that most students at the school currently drink is not detrimental to their health. C. Students are apt to be healthier if they do not drink soft drinks at all than if they just drink small amounts occasionally.
D. Students will not simply bring soft drinks from home if the soft drink vending machines are not placed in the cafeteria.
E. The school’s primary concern should be to promote good health among its students.
例题解析：
尽管在食堂放软饮售卖机学校会有财务好处，我们不应该允许它们。允许这种机器不符合学生利益。如果学生喝更多软饮，影响健康。此推理依靠一下哪个?
假设题关键因素应该包含软饮机 A 如果软饮机放在食堂，学生将消费更多软饮;将此机器放食堂与消费更多(即喝更多)联系起来，搭桥增强，正确
B 目前大多数学生喝的软饮数量对健康没有太大影响;没提到软饮机，无关，排除。
C 不喝软饮的学生比和少量软饮的学生更健康;没提软饮机，无关比较，排除。
D 如果软饮机不放在食堂，学生不会从家里带软饮;讨论的是软饮机不在食堂的情况，跳出范畴，排除。
E 学校的首要关注应该是提高学生健康;should 主观选项，且没提软饮机，排除。
例题3：
A study of ticket sales at a summer theater festival found that people who bought tickets to individual plays had a no-show rate of less than 1 percent, while those who paid in advance for all ten plays being performed that summer had a no-show rate of nearly 30 percent. This may be at least in part because the greater the awareness customers retain about the cost of an item, the more likely they are to use it.
Which of the following would, if true, best serve as an alternative explanation of the results of the study?
A. The price per ticket was slightly cheaper for those who bought all ten tickets in advance.
B. Many people who attended the theater festival believed strongly that they should support it financially.
C. Those who attended all ten plays became eligible for a partial refund.
D. Usually, people who bought tickets to individual plays did so immediately prior to each performance that they attended.
E. People who arrived just before the performance began could not be assured of obtaining seats in a preferred location.
例题解析：
在夏季戏剧节上，一项售票研究发现，买单个戏剧票的人不出现的概率小于1%，而提前支付所有十场戏剧票的人不出现率接近30%。这可能至少部分因为，越注意到一件东西的成本，他们越可能用它。
削弱题，对研究结果的另一种解释
A.提前买十张票的人每张票成本稍微便宜点;增强，方向反，排除
B.很多参加戏剧节的人强烈相信他们应该从财务上支持他;主观选项，排除
C.参加十场戏剧的人有权获得部分退费;
D.经常性地，人们买单个戏剧票的人在每场戏马上开场前才买票;即买单个戏剧的人在开场前才买票导致不出现率低，削弱了因为注意到成本导致不出现率低，他因削弱，正确 E.在开场前刚到的人不能确保得到想要的座位;显然无关，排除
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