这题我做多次，错多次，还是不明白

想知道你们选那个，为什么？

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 quaility of gasoline. Therefore, the brands of gasoline

for sale on Haibei may be different in name and price, bat they 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 Hailed always receives the same quanity of

gasoline as that in the preceding delivery.

C)There is a wide variation in the price at which the different

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 methods

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.

楼上的是猜得吧

说说理由

(我把题号改过来了)

B

应该是D。

判断假设的时候，吧原因和结论先列出来：因为都来自于一个油罐，即使各个卖油的公司价格和品牌不同，但品质都一样。

这样就在下面的假设中找可促使结论成立的关联。很明显A，消费者知道不知道品质如何，对结论无效；

B，是否油罐的前后品质一致无所谓的，因为只要某一阶段各个公司从油罐拿到的油品质一样即可，此选项有迷惑性；

C，无关

D，说明无论那个公司私自改善品质，其他公司都会跟进，促使所有油脂一样品质，支持了结论。

E)，无关

嘿嘿，不是猜的，原文是说源头的quality一样，结论是说实际售出的quality也一样，那么假设当然是说保证中间过程哪怕quality有变化，结果还是一样。搭桥。

不过我倒更喜欢那个“手误”的推理方式，同样管用不是么

我总是掉在B里出不来。

现在好像明白些了，谢谢！

前提：Ｈ处的石油公司全从一个地方弄油出来，结论：不管价钱怎么样质量都一样

Ａ．前提或结论一个都没提，跟ＣＯＮＳＵＭＥＲ无关

Ｂ．跟ＤＥＬＩＶＥＲＹ无关

Ｃ．没说价钱问题，说的是质量

Ｄ．正确，说质量了

Ｅ．无关

好像是在此找关键词一样。