攻克Gmat的逻辑评估题 只需一种技巧

Gmat考试中,逻辑-评估题是常见的一种题型,宁波环球教育陈如成老师教大家一种攻克此类题型的方法。
1.E monkeys in Rome often rub a certain type of worm into their fur. Secretions of these worms have been shown to contain two chemicals that are potent bee repellents, and bees carry parasites that debilitate the Es. The rubbing behavior is rare except during the rainy season, when bee populations are at their peak. Therefore, the monkeys probably rub the worms into their fur because doing so helps protect them against bees.
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Which of the following would it be most useful to determine in order to evaluate the argument?
A.whether the two chemicals provide any protection for the worms against their own predators.
B.Whether the type of worm used by the E monkeys in Rome is found in other parts of the world.
D.Whether the only time the worms are readily available to the Es is during the rainy season.
E.Whether secretions of any other insects accessible to the Es contain chemicals that repel bees.
主干逻辑链:E猴子常常挠一种蠕虫 – 而这种虫子的分泌物包含2种化学物质(可以抵制蜜蜂- 而这种蜜蜂附带寄生虫对E猴子有害 )——条件1:前面两横逻辑链简单总结为E猴子可以通过挠这种蠕虫抵抗蜜蜂附带的有害寄生虫;条件2:这种挠的行为是很罕见的除了再雨季时 而这时蜜蜂数量也是在高峰期
答案D:对D进行步骤1,仅仅在雨季他GMAT保分们可以接触到这些蠕虫,可以让他们很好的抵御蜜蜂,加强了文章的结论。对D进行步骤2否定答案,说明除了雨季其他季节也可以有这样的行为,所以雨季时的这种习惯也不一定是防止寄生虫的=理解为蠕虫的作用不一定是抵抗蜜蜂寄生虫的