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GMAT OG逻辑题目解析第十六题
Which of the following most logically complete the passage?
Pecan growers get a high price for their crop when pecans are comparatively scarce, but the price drops sharply when pecans are abundant. Thus, in high-yield years, growers often hold back part of their crop in refrigerated warehouses for one or two years, hoping for higher prices in the future. This year’s pecan crop was the smallest in five years. It is nonetheless quite possible that a portion of this year’s crop will be held back, since.
(A) each of the last two years produced record-breaking pecan yields
(B) the quality of this year’s pecan crop is no worse than the quality of the pecan crops of the previous five years
(C) pecan prices have not been subject to sharp fluctuation in recent years
(D) for some pecan growers, this year’s crop was no smaller than last year’s
(E) the practice of holding back part of one year’s crop had not yet become widespread the last time the pecan crop was as small as it was this year
翻译：
下列哪项最符合逻辑的将文章补充完整?
当山核桃相对稀缺时，山核桃种植者获得的农作物的价格高，但是山核桃产量丰富时价格又急剧下降。因此，种植者在高产年经常将山核桃放在冷藏仓库中放置一两年，希望价格在未来上涨。今年的山核桃产量在这五年中是最小的。但是很有可能今年的一部分收成将被贮藏，因为。
(A) 过去两年中每年都有破纪录的山核桃产量
(B) 今年的山核桃作物的质量不比过去五年的作物质量差
(C) 近年来山核桃的价格并没有受到大幅波动
(D) 对于一些山核桃种植户来说，今年的收成不比去年的更少
(E) 上一次山核桃作物的产量如今年的产量一样少时，贮藏作物的做法还没有流行
解析：
文中说明贮藏的做法是为了通过调节市场上的作物产量从而获得更高的价格，要支持文章结论，需找到影响市场上山核桃数量的前提条件。
A选项最为直接，说明前两年的产量大，存货多，影响价格，今年的产量小并不等于市场上的供货少，所以还是贮藏作物。
B选项和C选项无关。
D选项只能说明两年产量都少，如果成立的话，市场上存货少，就不应该贮藏了。
E选项只能说明以前贮藏不流行，但是无法支持文中推测出的关于现在贮藏的结论。
GMAT OG逻辑题目解析第十七题
Which of the following most logicallycompletes the argument?
By competing with rodents for seeds, blackants help control rodent populations that pose a public health risk. However, avery aggressive species of black ant, the Loma ant, which has recently invadeda certain region, has a venomous sting that is often fatal to humans. Therefore,the planned introduction into that region of ant flies, which prey on Lomaants, would benefit public health, since.
(A) ant flies do not attack blackants other than Loma ants
(B) Loma ants are less effectivethan many bird species in competing with rodents for seeds
(C) certain other species of blackants are more effective than ants in competing with rodents for seeds
(D) the sting of Loma ants can alsobe fatal to rodents
(E) some pesticides that could beused to control Loma ants are harmful to the environment
【翻译】
下列哪项最符合逻辑地将以下论证文章补充完整?
由于黑蚂蚁与啮齿类敌人竞争获得种子，它们帮助控制对公共健康构成风险的啮齿动物数量。然而，黑蚂蚁中的一种非常具有进攻性的L蚂蚁最近入侵某一个地区，它们的毒刺对人类来说往往是致命的。因此，将捕食L蚂蚁的蚁蝇引进到该地区的计划将有利于公众健康，因为。
(A) 蚁蝇不攻击除L蚂蚁之外的黑蚂蚁
(B) 在与啮齿类敌人竞争种子方面，L蚂蚁不如许多鸟类有效
(C) 与啮齿类敌人竞争获得种子方面，黑蚂蚁的某些其他物种更有效
(D) L蚂蚁的毒刺对于啮齿动物来说也可以是致命的
(E) 一些可以用来控制L蚂蚁的杀虫剂对环境有害
【解析】
文章论证想要说明因为L蚂蚁有毒刺会致命所以引进蚁蝇有利于公共健康。
A选项正确，说明蚁蝇会减少L蚂蚁数量，降低健康风险
B选项和C选项无关对比
D选项说明L蚂蚁对这一地区有好处，因为它控制了啮齿动物数量，引进蚁蝇消灭了L蚂蚁，可能会造成啮齿动物数量上升，对原文结论没有支持作用，反而削弱，对公共健康不利
E选项提出另外一种控制L蚂蚁的方式，偏离讨论对象，即引进蚁蝇的方式的好坏。
GMAT OG逻辑题目解析第十八题
Which of the following most logically completes the argument below?
下列哪一个选项最能有逻辑地完成下面的论证?
Using broad-spectrum weed killers on weeds that are competing withcrops for sunlight, water, and nutrients presents a difficulty: how to keep thecrop from being killed along with the weeds. For at least some food crops,specially treated seed that produces plants resistant to weed killers is underdevelopment. This resistance wears off as the plants mature. Therefore, thespecial seed treatment will be especially useful for plants that______________.
使用宽范围除草剂除去与庄稼争抢阳光，水分和营养的杂草面临一个困难：如何保留庄稼随着杂草的被杀死。对于至少一些粮食作物而言，特殊培育的能抵抗除草剂的种子正处于发展之中。这种抵抗会消失随着植物生长成熟。因此，这种特殊的种子培育将会特别有用对于那些植物，这些植物____________。
(A) producetheir crop over an extended period of time, as summer squash does
产生收成在一个广大的时间期间，就像summer squash
(B) producelarge seeds that are easy to treat individually, as corn and beans do
产生大种子能够容易地个别对待，就像玉米和豆子
(C) provide,as they approach maturity, shade dense enough to keep weeds from growing
提供，随着它们接近成熟，遮蔽足够的阴凉来抑制杂草生长
(D) aretypically grown in large tracts devoted to a single crop
被通常种植在大片一种单一作物的土地上
(E) arecultivated specifically for the seed they produce rather than for their leavesor roots
被特别地为了种子而种植而不是为了它们的叶子或者根茎
【解析】
这道题是一道填空题，填空作为一种形式，本质上可以考成各种题型，而本题考察的归纳，即正确答案应该能够从文章中推理出来。ABDE中的作物依旧都可以随着作物的生长，其抵抗杀虫剂的能力会消失。只有C选项中的作物，随着其自身生长成熟，可以抑制杂草生长，从而使得文章中所描述的对于种子的特殊培育有了意义，为正确答案。