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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
一般。 每一升中unrefine油中酸越少，质量越高。酸的比例就是酸度的衡量标准。问可以推断出什么！！
B. 错在only by（实际上也违背了题干给出的前提）
O Acid => Quality; O acid => Acidity. B and C are both inaccurate. However, B said that measuring the acidity is the only way. We don't know if it is the only way. So, finally the answer is C.
每一公升没有提炼过的油中含有的O酸越少，质量越好。O酸占到的比例是一个衡量酸度的方法
原文是unrefine A错 oa少=a少 推出质量高
宗老板说：a：段落完全米有提到refine的油的情况
B是文章的前提是冲突的。
注意，文章中出现了，the + 比较级（A），the + 比较级的表达形式（B）。这样的表达形式，其实是暗含了，其中的因果逻辑关系的。也就是A的增长，导致了B的增长，所以这是我们在判断选项答案的时候要注意的点。
Ron:GMAC's "draw conclusion" questions will ALWAYS require you to combine two or more statements from the passage.
文章主要说Uo的质量越高Fo acid含量越少 & Fo acid的比例是判断油acidity的。=选项：Uo的acidity中等，质量也是中等【相当于A推出B,A=C,C也可以推出B】
If an unrefined olive oil is intermediate （在。。中间）in acidity between two other unrefined olive oils, it will also be intermediate between them in quality.
如果一种未精制的橄榄油在两种其他未精制的橄榄油之间的酸度中间，则它们之间的质量也是中间的。
d选项可以通过，其他所含酸可能不显性来推翻
题干说 the quality of unrefined olive oil is not actually defined in term of acidity
为什么后来结论是 quality of unrefined olive oil can be measured in term of acidity.
难道是is not actually defined 不等于 can not be defined?
因为后面又一个yet让步吧，以后的讨论都朝着让步句中的方向去了
If an unrefined olive oil is intermediate （在。。中间）in acidity between two other unrefined olive oils, it will also be intermediate between them in quality.
如果一种未精制的橄榄油在两种其他未精制的橄榄油之间的酸度中间，则它们之间的质量也是中间的。
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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。