2016版《GMAT官方指南》闪亮登场，逻辑题目更换了32道新题(而非38道)，具体的解析目前正在紧张编写中。那么今天我们就一个新题，GMAT OG2016版第30题，为大家展望一下新趋势。点击查看更多OG2016解读

　　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 that 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.

　　强相关是否代表因果关系?这是基础逻辑学中非常容易被生活感知所误导的概念，理所应当是GMAT逻辑考试中最常出现的考点之一。模型简言之：

　　“因为A的发生总是伴随B的发生，所以A的发生能导致B的发生。”

　　哪里错了?我们讲过，还有另外两种可能：

　　1. 因果倒置，其实B的发生才导致A的发生。

　　2. 第三方原因，另有C的发生才导致AB总能一起发生。

　　就像刚才OG的新题，前提在强调“好人”总是伴随“好命”，从而提出结论“好人”才导致“好命”。是不是非常熟悉?所以我们要提前想到两种削弱方式：

　　1. 因果倒置，有“好命”的人才能变成“好人”。

　　2. 第三方原因，另有它因能导致有“好命”的“好人”。

　　在上一版题目当中，正确答案是当时的A选项：

　　A. In the communities studied, women were much more likely to do regular volunteer work than men were, and women tend to live longer than men do.

　　找到了“女人”这个第三方原因，即女人“人好命也好”。

　　而在最新一版题目当中，正确答案是D选项，赤果果的因果倒置：

　　D. People tend not to become involved in regular volunteer work unless they are healthy and energetic to begin with.

　　所以新版OG在向我们透露，这样的削弱方式会是今后考试的重点。事实确实如此，在2015年更换6次的题库中，已经出现23个题都是类似的考法。

　　最后再总结几句肺腑之言。我们备考GMAT逻辑，一方面要继续加强单词长难句等基本功，一方面要把上面的逻辑方法复习好。只要考到类似的模型，一定在脑海中设计一下有可能的正确方向。不管正确答案考哪个分支，都逃不出我们的手掌心。只有这样，在杀G成功之后蓦然回首，原来那些逻辑方法真的能惠及一生。好激动!GMAT不应该是我们的拦路虎，而应该是我们的良师益友。

　　教师介绍：张鹏，清华大学毕业，讲课思路逻辑清晰，讲解深入透彻，直击要害，并根据考试形势开设了预测分析的数学点题班，深受学生好评。

　　想听张鹏老师的课？这个暑假约起来！

　　限时特惠霸气点题，报名新东方GMAT点题班只需100元！

　　更多精彩内容尽在新东方网GMAT频道，同时也可关注我们的微信平台（微信号：newgmat）

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