gwd-10-30

duanjt

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?

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.

Answer: C

我觉得C还是有问题，因为B选项中已经提示我们accidity并不是唯一决定质量的因素，因此应该是在三unrefined olive oil 其他方面都一样的情况下，accidity越底，质量才越高。

duanjt

sorry，又发错地方了，请斑竹转到逻辑区讨论吧。

joe11

up 俺也不会

Ａ咋不对呢？请赐教。

ricky663

这题开始说油的质量不能由酸度决定，后来发现，自由酸含量低，质量高，而自由酸决定了酸度。

所以结论是，酸度是能够决定油的质量的，而C就是一个例子。

其它选响有ONLY，是错的。

希望这个解释能让大家明白。

horsefish

以下是引用joe11在2004-9-20 13:00:00的发言：

up 俺也不会

Ａ咋不对呢？请赐教。

这样的问题是从上向下, 原文没涉及的东西全是错的, A中refined oil根本没出现过.

mikeleven

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=56858

Maggiewjy

agree with ricky663. only 不符合原文的语气。 原文说的是一种accurate measure .但并没有指出是否是唯一的。c 是举例

rivergirl

那么答案终还是C咯? 看到前面的讨论也是不分上下都看晕了

华籍美人

本题开始说acidity并不是判定的标准，但是大量研究表明quality 与free oleic acid成反比，而从free oleic acid 的量又能精确推出acidity的量，所以quality与acidity 成比例，但文章并没有说肯定成反比，也可能成正比啊。

所以C说intermediated in the quality是对的，也避免了绝对化结论，没说acidity与quality是成正比还是反比

C是最佳答案

[此贴子已经被作者于2005-6-3 17:16:20编辑过]

lakeeast

A错.A说"When an olive oil is refined, the concentration of oleic acid in the oil is reduced",但文中没有说"refined oil"的quality比"unrefined oil"高,更没有说判定"refined oil"质量标准仍是"acidity".只是说"The proportion of free oleic acid that an olive oil contains is an accurate measure of the oil’s acidity."(both for refined oil and unrefined oil).所以A is out of scope.

如果原文中提到"extensive tests have shown that the less free oleic acid an olive oil contains per liter, the higher its quality. In addition, refined oil is of higher quality than unrefined oil."则A为正确选项.

C选项很好,因为它的讨论限于unrefined oil.