本节课的主要内容是GMAT写作常见逻辑错误中的无理假设，教会考生如何高效备考GMAT写作并获得理想的成绩，GMAT写作快速分析逻辑错误之无理假设，快和小编一起去学习一下吧。
The following appeared in a memorandum from the development director of the Largo Piano Company.
“The Largo Piano Company has long been known for producing carefully handcrafted, expensive pianos used by leading concert pianists. During the past few years, however, our revenues have declined; meanwhile, the Allegro Musical Instrument Company introduced a line of inexpensive digital pianos and then saw its revenues increase. In order to increase Largo’s sales and in fact outsell Allegro, we should introduce a line of digital pianos in a variety of price ranges. Our digital pianos would be likely to find instant acceptance with customers, since they would be associated with the prestigious Largo name.”
Discuss how well reasoned ... etc.
逻辑错误分析：
1. 同时性因果关系
1)主题句:The increase of revenue may just coincided with the sale of inexpensive digital pianos, while the two actually had no causal relationship.
2)论据：A公司销售额上升的真实原因是否是由于廉价数字钢琴生产线的引入。
2. 错误类比(横向)
1)主题句：the strategy used in other company may not be suit for the Largo Piano.
2)论据：适用于A公司的不一定适用于L公司。
3. 无理假设
1)主题句：The expected instant acceptance with customers may not be the case. As the factor the author cited, the revenue of the Largo Piano have declined during the past five years, it may no longer own the prestige.
2)论据：是否会得到持续接受?销售连续下降也许已经说明声誉的下降。价格的变化将带来产品市场定位的变化，可能会损坏品牌形象。
段落间的连接：
三个逻辑错误
1. 同时性因果关系》A公司销售额上升是因为商品廉价
2. 错误类比(横向)》适用于A公司的也适用于L公司
3. 无理假设》声誉一直没变
即使：
1, 即使销售额的上升是因为廉价产品的引入，那么对A成立的条件对B也不一定成立。
2. 即使A成立的条件B也能成立，那么题中还有一个无理假设的错误。更多相关内容请点击》GMAT写作备考侧重点分析。
The following appeared in a memorandum from the owner of Carlo‟s Clothing to the staff.
“Since Disc Depot, the music store on the next block, began a new radio advertising campaign last year, its business has grown dramatically, as evidenced by the large increase in foot traffic into the store. While the Disc Depot‟s owners have apparently become wealthy enough to retire, profits at Carlo‟s Clothing have remained stagnant for the past three years. In order to boost our sales and profits, we should therefore switch from newspaper advertising to frequent radio advertisements like those for Disc Depot.”
Discuss how well reasoned ... etc.
逻辑错误分析：
1. 无理假设
1)主题句：The foot traffic into the stone and the increase of owner’s personal wealth can not indicate the business growth of the Disc Depot.
2)论据：人流量是否代表利润?
2. 错误类比
1)主题句: The author commits a fallacy of a false analogy.
2)论据:服装与音像没有可比性
3. 因果关系
主题句：Other factors other than the radio advertisement that may contribute to the business growth of Disc depot should be considered and ruled out. Likewise, it is possible that there are some other reasons can explain the stagnant profit of Carlo’s clothing。
论据：还有他因，A导致了B的发生，但是B的发生还依赖于其他的因素C。
段落间连接：
三个逻辑错误
1. 无理假设》人流量是否代表利润
2. 错误类比》服装与音像
3. 因果关系》广告和收益不一定有因果关系
即使：
1. 人流量代表收益，利润高，那么广告不一定就是收益增加的原因。
2.即使广告就是收益增加的唯一原因，那么服装和音像也有不同点，不能类推。
The following appeared as part of a memorandum from the loan department of the Frostbite National Bank:
"We should not approve the business loan application of the local group that wants to open a franchise outlet for the Kool Kone chain of ice cream parlors. Frostbite is known for its cold winters, and cold weather can mean slow ice cream sales. For example, even though Frostbite is a town of 10,000 people, it has only one ice cream spot— the Frigid Cow. Despite the lack of competition, the Frigid Cow's net revenues fell by 10 percent last winter."
Discuss how well reasoned ... etc.
逻辑错误分析:
1. 因果关系错误
1)主题句：The author commits a fallacy of causal oversimplification that cold weather is responsible for the net revenues’ falling.
2)论据：排除他因，净收入下降的原因是什么?可能是经营不好，草率定价，甚至正因为缺乏竞争导致了这些。
2. 无理假设
1)主题句：The author falsely depends on gratuitous assumption that cold winter means no summer or short summer days.
2)论据：寒冷冬天不等于没有夏天，也不等于夏天短暂，不能说明原因。
3. 错误类比(纵向)
1)主题句：The statistics last year does not necessarily denote the future trend.
2)论据：过去不能推将来。
段落间的连接：
三个逻辑错误
1. 因果关系错误》净收入下降是因为寒冷的天气
2.无理假设》寒冷冬天不等于没有夏天，也不等于夏天短暂
3. 错误类比(纵向)>过去不能推将来
即使
1. 即使寒冷天气就意味着没有夏天或者夏天短暂，那么净收益下降也未必是因为寒冷的冬天。
2. 即使寒冷的冬天导致了收益的下降，那么过去的事情也不能推将来。
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