两道 GMAT 逻辑真题

qiuhbo

各位请发表一下看法。

4. In the United States, vacationers account for more than half of all visitors to what are technically called “pure aquariums” but for fewer than one quarter of all visitors to zoos, which usually include a “zoo aquarium” of relatively modest scope.

Which of the following, if true, most helps to account for the difference described above between visitors to zoos and visitors to pure aquarium?
(A) In cities that have both a zoo and a pure aquarium, local residents are twice as likely to visit the aquarium as they are to visit the zoo.
(B) Virtually all large metropolitan areas have zoos, whereas only a few large metropolitan areas have pure aquariums.
(C) Over the last ten years, newly constructed pure aquariums have outnumbered newly established zoos by a factor of two or one.
(D) People who visit a zoo in a given year are two times more likely to visit a pure aquarium that year than are people who do not visit a zoo.
(E) The zoo aquariums of zoos that are in the same city as a pure aquarium tend to be smaller than the aquariums of zoos that have no pure aquarium nearby.


5.An experimental microwave clothes dryer heats neither air nor cloth. Rather it heats water on clothes, thereby saving electricity and protecting delicate fibers by operating at a lower temperature. Microwaves are waves that usually heat metal objects, but developers of a microwave dryer are perfecting a process that will prevent thin metal objects such as hairpins from heating up and burning clothes.

Which of the following, if true, most strongly indicates that the process, when perfected, will be insufficient to make the dryer readily marketable?
(A) Metal snap fasteners on clothes that are commonly put into drying machines are about the same thickness as most hairpins.
(B) Many clothes that are currently placed into mechanical dryers are not placed there along with hairpins or other thin metal objects.
(C) The experimental microwave dryer uses more electricity than future, improved models would be expected to use.
(D) Drying clothes with the process would not cause more shrinkage than the currently used mechanical drying process causes.
(E) Many clothes that are frequently machine-dried by prospective customers incorporate thick metal parts such as decorative brass studs or buttons.



答案分别是 B 和 E。

mike1999

第一题关键在于分清vocationer 和visitor的区别。vocatione一般旅程较远要在外过夜的那种，visitor是那种短途观光。比如我在上海，我去上海动物园的水族馆就叫visitor.我去大连的水族馆
就是vocationer了。区分了这两点就可以做题了。
第二题试验的对象仅仅是thin metal objects ，而不是选项E中的thick metal objects, E自然削弱了。题干中的前半句话是干扰内容。看不懂也不要紧

qiuhbo

多谢 mike 的解释。

我自己做题时是这样分析 E 的，

既然题干中说明 thin metal objects 不会被烧坏，那么 thick metal objects 更加不会被烧坏了，因此 microwave dryer 洗这些衣服应该没有问题。所以没有选 E。
能分析一下你对 ets 思路的理解吗？

至于第一题的答案 B，是不是需要我们加上题干中没有的假设？

mike1999

第一题实际上是要求我们运用生活中的实际体验来解题。并没有加上其它假设。因为两者的定义已经很清楚了。
第二题是削弱题型。一种途径就是从削弱前提入手。它的前提是 prevent thin metal objects such as hairpins from heating up and burning clothes.所以引入与之对立的论据可以达到削弱的效果。至于微波炉的具体运行机制我们也搞不清楚，也不应该自己去判断。我们所要做的是从题目中的信息解题。

wubin

既然题干中说明 thin metal objects 不会被烧坏，那么 thick metal objects 更加不会被烧坏了，因此 microwave dryer 洗这些衣服应该没有问题。所以没有选 E。
Many clothes that are frequently machine-dried by prospective customers incorporate thick metal parts such as decorative brass studs or buttons.
你仔细读这句话就知既然Many clothes都 frequently incorporate thick metal parts 那你文中所说的优势developers of a microwave dryer are perfecting a process that will prevent thin metal objects such as hairpins from heating up and burning clothes.还有何用，就不能成为一个卖点，那还有什么市场。will be insufficient to make the dryer readily marketable