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题库 / GMATLA-CR-4
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?
When an olive oil is refined, the concentration of oleic acid in the oil is reduced
The quality of an unrefined olive oil can be determined only by accurately measuring its acidity.
If an unrefined olive oil is intermediate in acidity between two other unrefined olive oils, it will also be intermediate between them in quality.
Free oleic acid is the only acid that unrefined olive oil contains
People who judge the quality of unrefined olive oils actually judge those oils by their acidity, which the judges can taste
define是指“定义”不涉及比较，但是原文其后补充了unrefined olive oil的free oleic acid越少，unrefined oliver oil的qualtiy越高，并且free oleic acid的比例是衡量oil酸度正确的标准。所以可以推出酸度越低，unrefined olive oil的quality是越高的。C正确。
define得出的（个人觉得应该)是指一个具体的数值或标准。比如说白酒的qualtity不能由酒精浓度来定义因为所采用的工艺和原料等都会影响的白酒的quality，如果我们要给这瓶白酒打分，可以是因为酒的工艺好原料好却因为酒精浓度不高，我们只给它75分。可是这只对是某一瓶白酒quality的评价，而我们通常都会说酒精浓度越高越纯的白酒，质量更好的，这才涉及到了不同的白酒间的简单比较。
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