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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
虽然橄榄油的质量不能用酸度来定义，但是酸度确实能够反映橄榄油的质量！
错因：没读懂材料
对
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人们不能用acidity去define橄榄油的质量，但是越多含量的Oleic acid, quality is better, and the % of Oleic acid is an accurate measurement for acidity.
So, acidity 越高，Oleic acid % 越多，质量越好
not actually defined表明没有正式定义（有点像没有官方说法），但这不代表作者否定两者的联系！注意中间用的yet，转折词之后的才是作者的态度。
纠结了E：结论要结合题目中的好几条信息，但是E只说了味道，没有提到比例，而且人不能准确品尝出酸味
酸度不能定义质量，但是后面又说油里面的某个酸越少，油的质量越高，结论又是说油里面某个酸的多寡可以准确衡量油的酸度，所以其实还是变向在说油的酸度可以反映质量
题目看清楚呀
B项说检测质量only只有一个方法不对
结论题，是原文中可以推出来的，c选项可以推出来，但是e选项推不出来
漏了B的only.....
OA的含量代表了质量，OA也代表酸度。，三者都是可以一一对应的关系。不用考虑其他的酸和可能性，简单粗暴。
看清楚最后一句，最后一句是解释游离油酸，不是说游离油酸可以决定油的质量
看的太飘了，这是归纳题。
酸度不能评判橄榄油的好坏，但 free oleic acid越少，unrefined橄榄油质量好。free oleic acid是衡量酸度的指标。
A/E. irrelative
B/C. only ×
C. 通过酸度衡量质量好坏 → support √
Donly不对
A没有提到refined 不要咭咭瞎猜
C正确的原因：free oleic acid less-->quality higher
free oleic acid proportion-->measure acidity
Ron:GMAC's "draw conclusion" questions will ALWAYS require you to combine two or more statements from the passage.
A没提到精炼就是减少酸这件事
B没提到only by
D没提到是only酸
E酸是用一种measure来测量的，而非taste
题目在说酸度不是一种“对橄榄油质量的定义（事实上人民不会仅(actullay)通过酸度去评价橄榄油好不好）”，但确实是一种“日常对质量的衡量标准”,E错在actually，和文章给出的条件冲突.
虽然油的质量标准并不是直接以酸度来定义。但是每一升未提炼的油中所含有的oleic acid越少，油的质量就越高。油中所含free oleic acid的比例是一个油的酸性的测量标准