GWD-10-30答案不确定，我自己的一点看法，欢迎指教

alanis_liu

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 ?

 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.

我搜索了以前的帖子，答案基本定在A或者C。

我选的是A

至于为什么不选C，我想了这样一个例子来证明，大家看行不行

三瓶油：A，B，C。A有100的酸，B有50的酸，C有25的酸，B的酸在两者之间，现在假设B的质量也在两者之间，比如还是50分，正如C所说的一样。但是！A的质量跟C的质量你是不知道的，只有一个大于50分，一个小于50分就可以了，两者可以交换，这样就不能证明到底是酸多了质量好还是算少了质量好，充其量就是说明了B的酸度和质量都是在中间，并没有支持原文。

大家如何看待，欢迎讨论！

另外关于A，也有点问题，根据常识来说精炼过的油质量要比没精炼的油质量好，但是这是我们自己认为的，题目也没说，这样会不会有问题？

[此贴子已经被作者于2007-4-5 10:25:36编辑过]

hgconnie

觉得C好。

因为文章说的是unrefined oil, 没有说到refined oil,怎么得出A？是主观的成分太多了。

C可由文章最后一句直接得出。acid oil决定酸度，决定质量。符合老美的傻瓜思路。

呵呵，你觉得呐？

alanis_liu

但是C无法得出olive oil低oil质量就好的结论啊，用我那个例子就可以证明阿 

hgconnie

“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.”

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

呵呵，明白了不？

hgconnie

另：突然发现你提的问题是“充其量就是说明了B的酸度和质量都是在中间，并没有支持原文。”

而这里题目问的是，能从文章推出什么？

老兄，你是不是看成了支持题呢？