[求助]TT GWD1-30

Q30:

The quality of unrefined olive oil is not actually defined in terms of acidity, yet extensive tests have shown that the less free oleic acid an unrefined olive oil contains per liter, the higher its quality.  The proportion of free oleic acid that an olive oil contains is an accurate measure of the oil’s acidity.

If the statements above are all true, which of the following conclusions is best supported by them ?

1. When an olive oil is refined, the concentration of oleic acid in the oil is reduced.
2. The quality of an unrefined olive oil can be determined only by accurately measuring its acidity.
3. If an unrefined olive oil is intermediate in acidity between two other unrefined olive oils, it will also be intermediate between them in quality.
4. Free oleic acid is the only acid that unrefined olive oil contains.
5. People who judge the quality of unrefined olive oils actually judge those oils by their acidity, which the judges can taste.

   Answer: C

   How can C be supported? Isn't it contradictive with the first sentence "The quality of unrefined olive oil is not actually defined in terms of acidity"? Please help advise. Thanks.

http://forum.chasedream.com/dispbbs.asp?boardid=24&replyid=1727450&id=56858&page=1&skin=0&Star=1

总结一下就是第一句话描述了一种状态，而被后面的事实否定了

哦，这样就清楚了。谢过~~~！

想了半天我最后决定也是C。

其实文章第一句话的意思就是说橄榄油的quality 不是由 acidity定义的（判断的标准）。for example, 如果2个橄榄油的acidity 是相同的，我们可以说他们的quality 就相同吗？

yet 后的文字说明了少 acid 的橄榄油quality 要好一点。这个是一个比较的概念（在比较橄榄油之间的acid), 而不是一个判断的标准(用acid 来判断橄榄油质量的好坏）。

C里面也在重复这个比较的概念，我觉得C比较正确一点。