这道逻辑题什么逻辑？摘自新东方陈向东

clqy0918

Although many brands of gasoline are sold on Haibei island
    

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Although many brands of gasoline are sold on Haibei island, gasoline companies there get all of the refined gasoline they sell from Haibei seaport’s only storage tank, which is always refilled with the same quality of gasoline. Therefore, the brands of gasoline for sale on Haibei may be different in name and price, but there are identical in quality.
The conclusion drawn above depends on which of the following assumptions?
a) Consumers are usually unaware of variations in the quality of the gasoline they buy unless those variations are announced by the gasoline companies.
b) When tankers make gasoline delivery at Haibei’s seaport, the storage tank an Haibei always receives the same quality of gasoline as that in the preceding delivery.
c) There is a wide variation in the price at which the deferent brands of gasoline on Haibei are sold.
d) If any gasoline company on Haibei alters the quality of its gasoline before sale, the other gasoline companies also use method before sale that result in the same change in the quality of their gasoline.
e) The gasoline storage tank on Haibei’s large enough to meet the needs of all of Haibei’s different gasoline companies.

正确答案是D。不是很理解，既然汽油供应源只有一个，那些公司还怎么alters the quality of its gasoline before sale？

望有兴趣的同学指点一下~谢谢^.^

denniskang__

我觉得不考虑是否合理，而是D如果成立，是否assumption

把d取非--〉来源相同但是卖的质量却会不同

我想D就是否定一个可能性

KennyChenzju

Assumption在这一道题就是一个桥梁的作用。题目告诉卖的油来源是XX岛，都是同一个container同样的quality，所以卖出去的quality是一样的。这里的从“油的来源”推断“卖出去的油”，本身推理是有一个跳跃的。所以要把这两个link起来。只管逻辑，不管题意是否符合现实

sausau

这道题我也错过。至于你提出的问题，我也同样有过。石油嘛，都是从原油里面提炼，提炼纯度不一样，质量就不一样了萨。93，98号油肯定都是一个妈妈生的。

d的答案就是，如果本来大家都是卖93号油，但是有一家把98号油搞出来了，那么其他家都迅速提炼出98号油了。大家的生产能力都一样。