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Ykong · 发表于 2010-10-9 22:29:09

希望能详细解释，谢谢！
The value of a product is determined by the ratio of its quality to its price. The higher the value of a product, the better will be its competitive position. Therefore, either increasing the quality or lowering the price of a given product will increase the likelihood that consumer will select that product rather than a competing one.

Which of the following, if true, would most strengthen the conclusion drawn above?

(A) It is possible to increase both the quality and the price of a product without changing its competitive position.

(B) For certain segments of the population of consumers, higher-priced brands of some product lines are preferred to the lower-priced brands.

(C) Competing products often try to appeal to different segments of the population of consumers.

(D) The competitive position of a product can be affected by such factors as advertising and brand loyalty.
(E) Consumers’ perceptions of the quality of a product are based on the actual quality of the product.

Every photograph, because it involves the light rays that something emits hitting film, must in some obvious sense be true. But because it could always have been made to show things differently than it does, it cannot express the whole truth and, in that sense, is false. Therefore, nothing can ever be definitively proved with a photograph.
Which one of the following is an assumption that would permit the conclusion above to be properly drawn?
(A) Whatever is false in the sense that it cannot express the whole truth cannot furnish definitive proof.
(B) The whole truth cannot be known.
(C) It is not possible to determine the truthfulness of a photograph in any sense.
(D) It is possible to use a photograph as corroborative evidence if there is additional evidence establishing the truth about the scene photographed.
(E) If something is being photographed, then it is possible to prove definitively the truth about it.

fudanwyh · 发表于 2010-10-10 00:16:10

１。Ｅ？
２。Ａ？

hjxsparrow · 发表于 2010-10-10 02:50:31

1题选E
首先B削弱，CD是无关选项，很快排除
A是一个比较好的干扰项，看上去有点道理，但是其实不对。我猜测你对A有所疑惑，用了取非看削弱的方法。
原题的推理是这样的V=Q/P，C和V正相关，从而得到C和Q/P正相关，推理出结论：Q上升或者P下降会提高竞争力C。
我们来看A选项，A选项是Q,P可以同时上升而C不变，这其实是题干中的前提推理出的另一个结论，不能用它来加强原文的结论。
你取非A选项之后得到的其实是推翻了整个题干的前提。如果Q,P同时上升C不可能不变，那么C必定不是和Q/P正相关的，那么V也不可能是和Q/P正相关，整个题干刚开始的话就都错了。
E明显更好，因为如果消费者对产品质量的判断不是基于真正的质量的，那么提升产品质量就未必会被消费者知道，那么提高产品质量就不能带来竞争力的提高

2题选A
题干中， photograph must in some obvious sense be true，但是它不能 express the whole truth and， in that sense, is false。推理得到结论是：photograph could prove nothing
简化一下： P CANNOT EXPRESS WHOLE TRUTH 推理出 P CANNOT PROVE ANYTHING
这个推理有个逻辑断层，需要补充这个断层，那就是CANNOT express the whole truth 就 CANNOT prove
就是A选项
其他都不对
做assumption首先看推理过程有没有逻辑断层，答案就是补充了逻辑断层的选项

Ykong · 发表于 2010-10-11 17:48:53

谢谢hjxsparrow的详细解释。

急需帮助，GMAT CR 2个，大牛请进

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