GMAT逻辑GWD-7的很多题目也都是经过小编精心挑选的，很有代表性，这些题目依旧是有翻译有选项分析，大家在练习时最好先自己整理思路，遇到有问题的地方互相讨论。
GWD-7
Q5:
Exposure to certain chemicals commonly used in elementary schools as cleaners or pesticides causes allergic reactions in some children. Elementary school nurses in Renston report that the proportion of schoolchildren sent to them for treatment of allergic reactions to those chemicals has increased significantly over the past ten years. Therefore, either Renston’s schoolchildren have been exposed to greater quantities of the chemicals, or they are more sensitive to them than schoolchildren were ten years ago.
通常用于清洁剂或杀虫剂中的特定的化学物质经常会引起孩子的过敏反应。R地的小学医务室报告显示在过去十年内，因上述过敏原因而送到医务室来接受治疗的学童比例明显增加。因此，要么就是R地的学生被更多接触了上述化学物质或者他们变得比十年前的学生更敏感了。
Which of the following is an assumption on which the argument depends?
The number of school nurses employed by Renston’s elementary schools has not decreased over the past ten years.这儿比的是送来就诊的学生中过敏病例和其它病的比例，而不是医护人员的人均处理的病患比例，结论是要么过敏源更强了，要么孩子更容易过敏了。这项既没肯定前提，也没加强结论，所以无关。
Children who are allergic to the chemicals are no more likely than other children to have allergies to other substances.同A
Children who have allergic reactions to the chemicals are not more likely to be sent to a school nurse now than they were ten years ago. 题干有一个漏洞，就是没有说明以前的学生如果过敏了是不是都送到医护室来?如果以前没有都送来，而现在都送到医护室来，那么现在医护室的数据就只能说明现在的状况，而无法准确反应以前的状况，所以无法做比较。这个答案就是把这个漏洞补上了。正确。
The chemicals are not commonly used as cleaners or pesticides in houses and apartment buildings in Renston.这个答案想说的是只有学校才用这些含过敏源的产品，但结论并没有说是孩子是因为呆在在学校才过敏的，那么其它地方用或者没用都和结论无关，证明其它地方没用不能证明说学校用得多了;其它地方用了也不能推出学校就用得少了，因此两个可能都推不出孩子是不是比十年前接触了更多的促使过敏的产品。无关。
Children attending elementary school do not make up a larger proportion of Renston’s population now than they did ten years ago. 现在来读小学的孩子在总人口中的数量和十年前的这个数量和结论无关。结论是说因过敏而就医的孩子数量与总的送来就医的孩子数量。因为我们不知道总人口有没有变化，所以孩子的数量有没有变化，是什么样的变化无从知道，当然就更不知道十年前和现在送到医务室的孩子数量。无关。
Q14:
Certain politicians in the country of Birangi argue that a 50 percent tax on new automobiles would halt the rapid increase of automobiles on Birangi’s roads and thereby slow the deterioration of Birangi’s air quality. Although most experts agree that such a tax would result in fewer Birangians buying new vehicles and gradually reduce the number of automobiles on Birangi’s roads, they contend that it would have little impact on Birangi’s air-quality problem.
B国的一些政治家提出加征50%的购置新车税，他们相信这个决定会抑制B国目前急剧增加的汽车数量，从而改善减缓空气污染状况。尽管大部分专家认为增税会让新车卖出得少一些，并逐步地减少在路上行驶的汽车数量，但是他们认为这个措施对解决空气污染基乎不起什么作用。
Which of the following, if true in Birangi, would most strongly support the experts’ contention about the effect of the proposed automobile tax on Birangi’s air-quality problem?
Automobile emissions are the largest single source of air pollution.如果是这样的话，那即使更少的车会卖出去，路上的车也会减少，为什么会没作用呢?明显不是我们需要的答案。
Some of the proceeds from the new tax would go toward expanding the nonpolluting commuter rail system. 新增的税怎么用不在讨论范围内，我们关心的是增税为什么不能减缓空气污染?
Currently, the sales tax on new automobiles is considerably lower than 50 percent.不管现在的税是多低或多高，不管是政治家还是专家都认同增税后会让新车卖出的少一些。
Automobiles become less fuel efficient and therefore contribute more to air pollution as they age. 因为不买新车，所以大家都用旧车，这样造成的污染更严重。正确。
The scrapping of automobiles causes insignificant amounts of air pollution.题干没有提示说大家不买新车就去把旧车丢了，所以不管丢了的旧车引起的污染是严重还是不严重，这个前提就没有。
Answer:
Q17:
Of patients over 65 years old who survived coronary bypass surgery—a procedure widely prescribed for people with heart disease—only 75 percent benefited from the surgery. Thus it appears that for one in four such patients, the doctors who advised them to undergo this surgery, with its attendant risks and expense, were more interested in an opportunity to practice their skills and in their fee than in helping the patient.
事实：在超过65岁接受CB这种心脏手术的病人当中，有好转的只有75%。也就是说在承担了手术的风险和费用，四个接受了这个手术的病人(超过65岁的病人)当中，只有一个人的病情是有好转的。
结论：医生建议病人动CB手术的原因更多的是这个医生想赚钱和想在病人身上练手艺，而不是他想让病人的病情有所好转。
Which of the following, if true, most seriously undermines the argument?
Many of the patients who receive coronary bypass surgery are less than 55 years old.题干讲的是医生建议超过65岁的病人动这个手术是不安好心，所以不在这个年齡段的病人动不动手术或者动这个手术的人哪个年龄段更多一点都和此题无关。
Possible benefits of coronary bypass surgery include both relief from troubling symptoms and prolongation of life. 术后效果肯定是有可能产生的好处，要不神经病才去同意人家在自己胸口上动刀子。但题干的意思是这样的好处对于超过65岁的病人来说，实现的机率是不大的，在这样的情况下医生让病人动手术就是不安好心。此项不能证明医生是不是真的不安好心，所以无关。
Most of the patients in the survey decided to undergo coronary bypass surgery because they were advised that the surgery would reduce their risk of future heart attacks.同B
The patients over 65 years old who did not benefit from the coronary bypass surgery were as fully informed as those who did benefit from the surgery as to the risks of the surgery prior to undergoing it.题干并没有提示说医生是采取蒙骗的手段让病人同意动手术，题干的意思是对于超过65岁的病人，医生根本就不该提议说动这个手术，如果说了是不是出于利益和练手艺的考虑。此项不能说明，无关。
The patients who underwent coronary bypass surgery but who did not benefit from it were medically indistinguishable, prior to their surgery, from the patients who did benefit. 也就是说术前是不知道哪些病人的术后效果是好的，而题干也说了这个手术不是对于所有的超过65岁的病人都没用，所以当然不能说医生明知对哪个病人没用还劝他动手术。正确。
Q18:
Although the earliest surviving Greek inscriptions written in an alphabet date from the eighth century B.C., a strong case can be made that the Greeks actually adopted alphabetic writing at least two centuries earlier. Significantly, the text of these earliest surviving Greek inscriptions sometimes runs from right to left and sometimes from left to right. Now, the Greeks learned alphabetic writing from the Phoenicians, and in the process they would surely have adopted whatever convention the Phoenicians were then using with respect to the direction of writing. Originally, Phoenician writing ran in either direction, but by the eighth century B.C. it had been consistently written from right to left for about two centuries.
In the argument given, the two portions in boldface play which of the following roles?
The first is the position that the argument seeks to establish; the second reports a discovery that has been used to support a position that the argument opposes.
The first is the position that the argument seeks to establish; the second presents an assumption on which the argument relies.
The first presents evidence that is used in support of the position that the argument seeks to establish; the second presents an assumption on which the argument relies.
The first is an objection raised against a position that the argument opposes; the second is the position that the argument seeks to establish.
The first is an objection raised against a position that the argument opposes; the second is evidence that has been used to support that position.
Q21:
Which of the following most logically completes the passage?
Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators. In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures, which explains why ______.
每个品种的飞蛾有着可以保持正常飞行的体温要求，当然空气温度降到那个体温以下时，飞蛾往往会在植物上停留一段时间，这段时间它们是最容易被捕食的。一般来说，越大的蛾飞得越快因此也越不容易被捕食，但另一方面，它们需要保持更高的体温以飞行，这个就是为什么。。。。。。
large moths are generally able to maneuver better in flight than smaller moths我们只知道越大的飞得越快，我们并不知道越大的是不是就更飞得更好(maneuver better)。
large moths are proportionally much more common in warm climates than in cool climates 因为越冷越有可能达不到它们的飞行体温要求---》达不到它们就只有呆在哪片叶子上动不了----》呆在那儿就可能被吃-----》所以冷的季节大的活下来的比率小于温暖的季节。正确。
small moths are more likely than large moths to be effectively camouflaged while on vegetation.我们无从知道大小飞蛾在植物上如何伪装自己，所以谈不上比较。
large moths typically have wings that are larger in proportion to their body size than smaller moths do 我们知道大的飞蛾飞得更快，大的飞蛾需要更高的体温来飞行，但是我们不知道它们翅膀和身体的比例。而我们需要的是从已知事实来推出一个结论，显然这个比例结论推不出来的。
most predators of moths prey not only on several different species of moth but also on various species of other insects 吃飞蛾的也可能还有其它可吃的，也可能没有，这些都和飞蛾的体形、飞行的体温要求无关。
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