新GRE的逻辑题型有些难度，因为GRE考试已经有十年不考逻辑，平日也没有相应的训练，所以逻辑是一大难点。下面，小编带来的是GRE阅读逻辑题视频讲解，帮助大家克服这一难题。
一个完整的逻辑推理过程应由四个要素组成：
前提条件，现象，结论，证据。
举例说明：
A和B都是同样聪明的学生，A每天的学习时间比B每天学习的时间多一个小时，A一定比B学习好。汤姆和杰克就是最好的例子。
题目中的前提是A和B都是同样聪明的学生，现象是A每天的学习时间比B每天学习的时间多一个小时，结论是A一定比B学习好，论据是汤姆和杰克就是最好的例子。
逻辑问法举例：
1. Which of the following if true, would help resolve the apparent paradox present above?
2. In the argument given, the two portions in boldface play which of the following roles?
3. Which of the following if true, would most discredit the new theory as described in the passage?
4. Which of the following if true, would most strengthen the conclusion of the author?
概括起来所有的问题可以归为两类：
1 支持题
A 重述或强调前提
B 支持证据
C 排除它因
2. 反对题
A 直接反对前提
B 反对证据
C 给出其他原因
例题一：
Sparva, unlike Treland’s other provinces, requires automobile insurers to pay for any medical treatment sought by someone who has been involved in an accident; in the other provinces, insurers pay for nonemergency treatment only if they preapprove the treatment. Clearly, Sparva’s less restrictive policy must be the explanation for the fact that altogether insurers there pay for far more treatments after accidents than insurers in other provinces, even though Sparva does not have the largest population.
翻译：
Sparva，不像Treland的其它省，要求汽车保险商支付任何卷入事故者所要求的医疗费用;在其它省，保险商会支付非紧急治疗费用，仅在他们(保险商)预审同意的情况下。很明显地，Sparva限制性较低的政策解释了一个事实：Sparva地区的保险商在事故后总共支付的医疗费用比其它省的保险商(所支付的费用)高很多，尽管Sparva没有最多的人口。
Which of the following, if true, most strengthens the argument?
(A) Car insurance costs more in Sparva than in any other province.
(B) The cost of medical care in Sparva is higher than the national average.
(C) Different insurance companies have different standards for determining what constitutes emergency treatment.
(D) Fewer insurance companies operate in Sparva than in any other province.
(E) There are fewer traffic accidents annually in Sparva than in any of the provinces of comparable or greater population.
考生在做题之前首先要了解一下题目，这是一道加强题。要加强的就是文章提出的最后一个观点：不严格的政策是导致treatment很高的原因。(为了进一步证明，就需要排除其他的因素干扰：比如是否是交通事故太多，或者人口太多…)所以答案选E。
例题二：
In the United States between 1850 and 1880, the number of farmers continued to increase, but at a rate lower than that of the general population.
Which of the following statements directly contradicts the information presented above?
A The number of farmers in the general population increased slightly in the 30 years between 1850 and 1880.
B The rate of growth of the United States labor force and the rate of growth of the general population rose simultaneously in the 30 years between 1850 and 1880.
C The proportion of farmers in the United States labor force remained constant in the 30 years between 1850 and 1880.
D The proportion of farmers in the United States labor force decreased from 64 percent in 1850 to 49 percent in 1880.
E The proportion of farmers in the general population increased from 68 percent in 1850 to 72 percent in 1880.
做逻辑题时，步骤最好是：先看题目要求，再回头看短文，最后选择答案。先看题目要求是因为看题目要求才知读文章时的重点，便于有的放矢。
我们按照步骤先看题目要求。文章问道：“下面哪个选项与上面提供信息直接抵触矛盾?”这是一道削弱题。第二步再看文章。这道逻辑题很短，只有一句，意思是：“美国1850-1880年期间，农民数量持续增加，但是增加比例低于美国总人口增加比例。”选项A、B与原文信息相符。选项C、D与原文信息无关。选项E与原文的信息是矛盾的。所以答案选E。
篇章中的逻辑讲解
Recently some scientists have concluded that meteorites found on Earth and long believed to have a Martian origin might actually have been blasted free of Mars’s gravity by the impact on Mars of other meteorites. This conclusion has led to another question: whether meteorite impacts on Earth have similarly driven rocks from this planet to Mars.
According to astronomer S. A. Phinney, kicking a rock hard enough to free it from Earth’s gravity would require a meteorite capable of making a crater more than 60 miles across. Moreover, even if Earth rocks were freed by meteorite impact, Mars’s orbit is much larger than Earth’s, so Phinney estimates that the probability of these rocks hitting Mars is about one-tenth as great as that of Mars’s rocks hitting Earth. To demonstrate this estimate, Phinney used a computer to calculate where 1,000 hypothetical particles would go if ejected from Earth in random directions. He found that 17 of the 1,000 particles would hit Mars.
最近，某些科学家得出结论认为，那些在地球上发现的并一直被相信源自火星的陨石(meteorite)，实际上有可能是由于其它的陨石撞击火星而致使其被震离火星的重力作用范围。这一结论则又引发了另外一个问题：陨石对地球的撞击是否以类似的方式将岩石从我们这颗行星驱送至火星呢?
按照天文学家S.A.Phinney的研究，若要足够强劲地对一块岩石产生冲击力，使其脱离地球的重力作用，至少需要一块陨石在地球表面造成一个60多公里宽的撞击坑(crater)。除此以外，即使地球的岩石果真能由于陨石的撞击作用而脱离地球重力作用的话，但由于火星的轨道要比地球的轨道大得多，因此Phinney估算，这些岩石撞击火星的概率大概仅为火星岩石撞击地球概率的十分之一。为了论证这一估算，Phinney使用电脑进行测算，看看1,000颗假设的石块如果自地球以随机的方向弹射出去后有可能飞向何方?他发现，1,000颗石块中仅有17块将击中火星。
文章框架结构：第一段：最近科学家的观点： 其他陨石和Mars相撞，导致一些陨石脱离了Mars的引力，跑到了地球上。引起的问题：如果陨石碰撞了地球上，一些陨石是不是也会脱离地球引力跑到Mars上呢?
第二段：S.A.P觉得不可能：理由一：很难;得需要一个能制造出60miles坑的陨石;理由2： Mars的轨道比地球的轨道要大，所以概率也只有十分之一(P用数据证明了这一点)
Which of the following, if true, would cast most doubt on Phinney’s estimate of the probability of Earth rocks hitting Mars?
(A) Rather than going in random directions, about 25 percent of all particles ejected from Earth go in the same direction into space.
(B) Approximately 100 meteorites large enough to make a noticeable crater hit the Earth each year.
(C) No rocks of Earth origin have been detected on Mars.
(D) The velocity of rocks escaping from Earth’s gravity is lower than the velocity of meteorites hitting the Earth.
(E) No craters more than 60 miles across have been found on Mars.
答案：A
解析：定位在第二段最后一句话：论据：通过测从地球以任意方式散发的1000个粒子;得出结论：1000个里面只有17个撞到mars。要反驳该推论，只有A里面所讲的关键信息跟题干有关，而且是反驳的是“任意方向”这个点，符合题意。
总结：
逻辑题做题步骤：
一、看问题，抓好题型，是支持题还是削弱题;
二、分析题干，分好结论和前提;
三、理好逻辑推理过程后，再做题。
逻辑题要想做对，
一、一定抓好结论句;
二、分好结论和前提;
三、理好逻辑推理过程。
以上就是GRE阅读逻辑题视频讲解的内容，希望考生能够结合例题掌握其中的方法。
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