下面是GWD逻辑31套题的最后一套整理出的最后三道题目，希望这些题目能够为大家带来启发。
17: It is crucially important to farmers that the herbicides they use to control weeds not (?) damage their crops. One very effective herbicide is safe for corn, but soybeans are damaged even by the herbicide’s residue, which remains in the soil more than a year after the herbicide is applied. Soybeans and corn are not sown together in the same filed; nevertheless, most farmers are reluctant to use the herbicide on their corn.
对于农民非常重要的就是他们用来除杂草的杀草剂不会伤害到其它农作物。有一种非常有效的除草剂对玉米是无害的，但是即使是其残留物也会损害到大豆。(这种除草剂在使用后其残留物会留在土里一年以上的时间)。尽管大豆和玉米不会栽在同一片地里，大多数农民仍不愿意在种玉米的地里使用这种除草剂。
Which of the following, if true, provides the strongest justification for the farmers’ reluctance?
A: The residue of the herbicide in the soil a year after application is not enough to control most weeds effectively. 残留物一年后对杂草没有，但是仍然可以损伤到大豆。需要解释的是为什么因这个原因，农民也不在种玉米的地里用这种除草剂。
B: To maintain the nutrients in the soil, corn and soybeans are often planted in a field in alternate years. 现在种玉米的地可能明年就会用来种大豆，如果今年用了除草剂，那就会损害到明年要种到这块地来的大豆。正确。
C: The demand for soybeans is growing faster than is the demand for corn. 不能解释题干中的现象。
D: For maximum yield, soybean plants are grown closer together to each other than are corn plants. 同C。
E: The application of herbicides is less critical for soybean than for corn crops. 同C。
19: Sonya: The government of Copeland is raising the cigarette tax. Copeland’s cigarette prices will still be reasonably low, so cigarette consumption will probably not be affected much. Consequently, government revenue from the tax will increase.
Raoul: True, smoking is unlikely to decrease, because Copeland’s cigarette prices will still not be high. They will, however, no longer be the lowest in the region, so we might begin to see substantial illegal sales of smuggled cigarettes in Copeland.
S说：C国政府将会提高香烟税。即使在调高税后，C国的香烟价格仍然比较低，所以香烟的消费量不太可能受到多大影响，相应的，政府的香烟税收会增加。
R说：抽烟量不会减少是事实，因为C国的香烟价格仍然不高。但是不久(C国的香烟价格)就不会是在这个地区最便宜的，所以我们不久就会在C国看到大量的直径香烟。
Raoul responds to Sonya’s argument by doing which of the following?
A: Questioning the support for Sonya’s conclusion by distinguishing carefully between No change and no decrease S并没有说什么不会变化，同样的R也就没强调不会变化和不会减少之间的差异。
B: calling Sonya’s conclusion into question by pointing to a possible effect of a certain change. S的结论是可以增加税收，R的结论是税收引的另一种可能：走私烟会增多----》税收不一定会增加。正确。
C: Arguing that Sonya’s conclusion would be better supported if Sonya could cite a precedent for what she predicts will happen. R不认为S的结论可以成立，也不认为有什么前提就可以让结论成立。
D: showing that a cause that Sonya claims will be producing a certain effect is not the only cause that could produce that effect 增税后导致了市面上大量的走私烟是现象，其结果是S的结论不会成立。这个选项只提了现象，但是R提出这个现象的原因是为了让S的结论不成立，在这个选项没有涉及这点，所以错误。
E: pointing out that a certain initiative is not bold enough to have the predicts it will have R认为负面的结果一定会出现，并不认为S的事实只是不足以让预期效果出现。
29: Rail Executive: Five years ago we discontinued train service between Lamberton and its suburbs because low ridership caused total fares collected to be substantially lower than the cost of operating the service. it is true that recent population growth in the suburban communities suggests increased potential ridership, nevertheless since most of the newer residents own automobiles, restoring the train service this year would still result in serious deficits.
铁路经理主管人员：五年前由于低乘坐量，我们中断了L和其郊区的铁路运输服务，因为服务销售远远低于维持费用。现在郊区社区不断增加的人口显示有更多的潜在乘客是事实，但是因为很多新搬到郊区的居民都有私车，所以如果在今年恢复这项服务，我们仍然赔钱。
Which of the following, if true casts the most serious doubt on the rail executive’s argument? 找一个理由说不会赔钱
A: once train service along a given route has been discontinued, there are substantial start-up costs associated with restoring service along that route. 这个是说除了题干中所提到的没有足够的人来坐火车外可能导致赔钱外，还有额外的重新开通服务费用，那不是暗示更要赔钱吗?
B: most of the new residents of Lumberton’s suburbs do not need to travel into Lamberton regularly for shopping or recreation 人多了，但需要到市区的人并不多，支持铁道管理人的观点：没有足够的乘客。
C: if train service were restored this with increased hours of service there would not be an increase in total ridership 同B，支持铁道管理人的观点。
D: A survey conducted last year showed that few people living in Lamberton or its suburbs support increased public funding for mass transportation 无关。
E: Recently there have been sharp increases in parking fees in Lamberton and in highway tolls on major commuter routes. 即使有车，但如果开车去L城会花很多钱在高速公路费和泊车费上。所以这些人都可能坐火车而不自己开车。可以推出来的是有足够的乘客。正确。
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