GMAT考试大家普遍反映是逻辑比较难，
gmat逻辑题解读的例子：
The number of applications for teaching positions in Newtown’s public schools was 5.7 percent lower in 1993 than in 1985 and 5.9 percent lower in 1994 than in 1985. despite a steadily growing student population and an increasing number of teacher resignations, however, Newtown does not face a shortage in the late 1990’s.
Which of the following, if true, would contribute most to an explanation of the apparent discrepancy above?
【A】Many of Newtown’s public school students do not graduate from high school
【B】New housing developments planned for Newtown are (shared) for occupancy in 1987 and are expected to increase the number of elementary school students in Newtown’s public
【C】The Newtown school board does not contemplate increasing the ratio of students to teachers in the 1990’s.
【D】Teachers’ colleges in and near Newtown produced lower graduates in 1994 than in 1993
【E】In 1993 Newtown’s public schools received 40 percent more applications for teaching positions than there were positions available.
逻辑其实考的是阅读。技巧为相关性选择，即正确答案与原文存在逻辑相关性。如果剩下两个答案都与原文存在逻辑相关性，则这两个选项的方向相反(如一个说增加，一个说减少)。通常90%的GMAT逻辑题只需要根据相关性即可做出。
相信如果你有足够的时间把这道题目全部翻译成中文，应该不存在任何难度。
原文说在N这么个地方有个公立学校，93年教师职位申请率比85年降了5.7，94年教师职位申请率比85年降了5.9，【尽管学生数量和教师辞职数量都上升，但是N在90年代并没有出现短缺现象】。
简化一下，题目关注了这么一个事情，93和94年教师申请比85年少了一个百分比，学生数量和辞职率都涨了，但是教师并没有短缺。所以正确选项必然是与括号里短缺不短缺相关。