求解 GWD3-Q18、GWD 5-Q30、GWD6-Q33 逻辑题

叁横一树 · 发表于 2009-12-10 12:47:48

GWD3-Q18:

Which of following most logically completes the argument?

The last members of a now-extinct species of a European wild deer called the giant dear lived in Ireland about 16,000 years ago.
Prehistoric cave paintings in France depict this animal as having a large hump on its back.
Fossils of this animal, however, do not show any hump.
Nevertheless, there is no reason to conclude that the cave paintings are therefore inaccurate in this regard, since ______.

A.some prehistoric cave paintings in France also depict other animals as having a hump
B.fossils of the giant deer are much more common in Ireland than in France
C.animal humps are composed of fatty tissue, which dose not fossilize
D.the cave paintings of the giant deer were painted well before 16,000 years ago
E.only one currently existing species of deer has any anatomical feature that even remotely resembles a hump
当时在B/C徘徊，因为我觉得B说prehistoric paintings是在France，而fossils是在Ireland，地方不一样，所以两种品种不一样，前者有hump，后者没有。这样理解不对吗？

-------------------------------------------------------------------------------------------------------------------------------------------GWD 5-Q30:
Which of the following most logically completes the argument?

The irradiation of food kills bacteria and thus retards spoilage.
However, it also lowers the nutritional value of many foods.
For example, irradiation destroys a significant percentage of whatever vitamin B1 a food may contain.
Proponents of irradiation point out that irradiation is no worse in this respect than cooking.
However, this fact is either beside the point, since much irradiated food is eaten raw, or else misleading, since _______.

A.many of the proponents of irradiation are food distributors who gain from food’s having a longer shelf life
B.it is clear that killing bacteria that may be present on food is not the only effect that irradiation has
C.cooking is usually the final step in preparing food for consumption, whereas irradiation serves to ensure a longer shelf life for perishable foods
D.certain kinds of cooking are, in fact, even more destructive of vitamin B1 than carefully controlled irradiation is
E.for food that is both irradiated and cooked, the reduction of vitamin B1 associated with either process individually is compounded

我明白关键是要说明cooking和irradiation没有可比性，但是网上搜到了C、E两种答案，各有各自的看法，请问应该选什么？
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GWD6-Q33:
Crowding on Mooreville’s subway frequently leads to delays, because it is difficult for passengers to exit from the trains.
Subway ridership is projected to increase by 20 percent over the next 10 years.
The Metroville Transit Authority plans to increase the number of daily train trips by only 5 percent over the same period.
Officials predict that this increase is sufficient to ensure that the incidence of delays due to crowding does not increase.

Which of the following, if true, provides the strongest grounds for the officials’ prediction?

A.By changing maintenance schedules, the Transit Authority can achieve the 5 percent increase in train trips without purchasing any new subway cars.
B.The Transit Authority also plans a 5 percent increase in the number of bus trips on routes that connect to subways.
C.For most commuters who use the subway system, there is no practical alternative public transportation available.
D.Most of the projected increase in ridership is expected to occur in off-peak hours when trains are now sparsely used.
E.The 5 percent increase in the number of train trips can be achieved without an equal increase in Transit Authority operational costs.

完全不明白。我的理解是，subway因为车厢太拥挤，乘客不能下车而导致常常晚点，于是subway决定增开班次，然后题目问哪个选项可以support这项政策。虽然我觉得选项都怪怪的，可是为什么会选D呢，D的意思不是说“大多数计划增开的班次都是在非高峰时段，当很少trains被用的时候”吗？有关系吗？
------------------------------------------------------------------------------------------------------------最后我想请大家预测一下，2010年1月的考题，CR会不会比GWD难啊？比OG难多少？比FF难多少？大全呢？万分感谢~~！！

afu1124 · 发表于 2010-1-21 21:17:07

对于这道题的讨论还挺多的，但是只有mindfree大牛的以下说法让我有点明白：Here all we know is that crowding is to blame for delay. So 20%ridership, is occurs only during off-peak time, will not cause crowdingproportionately (20% to 20%). Therefore 5% increase in trips might wellmitigate the problem.

但是我认为还需要再理清一下这道题的思路。
Premise 1 Crowding 导致delay，于是Subway ridership is projected to increase by 20 percent.
Premise 2 MT authority 打算增加20%班次，但车辆只增加5%。
conclusion Officials predicts 这样做就可以解决由crowding导致的delay问题。

这里，需要补充的逻辑漏洞是什么？之前的讨论都绕在Premise1 和premise 2 是怎么对上号上。也就是为什么增加20%班次，5%车就能解决crowd导致的delay问题。但是看看选项怎么都对不上号，就连正确答案D也有点怪怪的：凭什么新加的20%是放在train 的off-peak time就能解决crowd问题？

其实，根据答案，我认为这题的逻辑漏洞在Premise 2这里：为什么加了20%班次，只要5%车就够用了？那回答就是选项D：因为有些班次是加在off-peak time的，所以不需要增加20%车，5%就够了，就能解决crowd问题。

总的来说这题设计的还是很莫名其妙的，至少在提问部分没让人看出想问的是这个逻辑加强问题。但是答案又是按这个思路来的。premise 1只是一个背景知识，不在逻辑链上。

求解 GWD3-Q18、GWD 5-Q30、GWD6-Q33 逻辑题

GWD6-Q33

所属分类: GMAT考试

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