题目信息
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 ?
A:When an olive oil is refined, the concentration of oleic acid in the oil is reduced.
B:The quality of an unrefined olive oil can be determined only by accurately measuring its acidity.
C:If an unrefined olive oil is intermediate in acidity between two other unrefined olive oils, it will also be intermediate between them in quality.
D:Free oleic acid is the only acid that unrefined olive oil contains.
E:People who judge the quality of unrefined olive oils actually judge those oils by their acidity, which the judges can taste.
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正确答案：
C:If an unrefined olive oil is intermediate in acidity between two other unrefined olive oils, it will also be intermediate between them in quality.
前提1：非提炼油的质量不能简单地用酸度来定义。 前提2：一种酸free oleic acid的含量越低，非提炼油的质量越高→描述的是酸的含量和非提炼油质量的负相关性 结论：C如果一种非提炼油的酸度在其他两种非提炼油的酸度之间，这种油的质量也在二者之间→文章说的就是酸和油质量间的关系。A当非提炼油被提炼后，油的free oleic acid的含量降低→文章只讨论非提炼油的情况，没有提及提炼后的油，错 B只有通过准确测量酸度，才能确定非提炼油的质量→和前提1相斥 Dfree oleic acid是非提炼油中含有的唯一一种酸→文章没有提及 E人们一般通过品尝非提炼油的酸味来判断其味道→文章没有提及
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