kui-cr-8/12-1

Though sucking zinc lozenges has been promoted as a treatment for the common cold, research has revealed no consistent effect. Recently, however, a zinc gel applied nasally has been shown to greatly reduce the duration of colds. Since the gel contains zinc in the same form and concentration as the lozenges, the greater effectiveness of the gel must be due to the fact that cold viruses tend to concentrate in the nose, not the mouth.

In order to evaluate the argument, it would be most helpful to determine which of the following?

1. Whether zinc is effective only against colds, or also has an effect virally caused diseases


2. Whether there are remedies that do not contain zinc but that, when taken orally, can reduce the duration of colds.


3. Whether people who frequently catch colds have a zinc deficiency.


4. Whether either the zinc gel or the lozenges contain ingredients that have an impact on the activity of the zinc.


5. Whether the zinc gel has an effect on the severity of cold symptoms, as well as on their duration

俺选B把，

A说only说得绝对了点

结论：the greater effectiveness of the gel must be due to the fact that cold viruses tend to concentrate in the nose, not the mouth.

检验的方法依然是：

如果否定A，ZINC不是唯一有效的治感冒的成分，lozenge和gel没有了推理的共同点，则如何吃ZINC也就没有比较的意义了。因为，可能是别的原因促使gel更加有效，原文结论受到他因削弱。

如果肯定A，ZINC是唯一有效的治感冒的成分，而且是lozenge和gel共有的成分，两种药的使用方法不同（一个吃，一个鼻子吸），但是效果却大不一样，当然可能是吃药的方法不同导致了效果不同（鼻子吸效果好，进而推出细菌在鼻孔里之类）。因而加强结论the greater effectiveness of the gel must be due to the fact that cold viruses tend to concentrate in the nose, not the mouth.。

参与讨论: 对以上解题思路的问题:

"Since the gel contains zinc in the same form and concentration as the lozenges, the greater effectiveness of the gel must be due to the fact that cold viruses tend to concentrate in the nose, not the mouth."是argument.我理解此句子的重心在于cold viruses tend to concentrate in the nose, not the mouth.-- 口鼻之争. 前提是使用方法不一样(产品一样,口服无效,鼻吸效果明显).

另外A的含义不象楼上解释的: -- Zinc 是否仅对感冒有效,或者对由病毒引起的其他病也有效.(如果选A,回到Argument 这里面就包含另一个assumption---在鼻子里的cold virus 是其他病毒 )  A是either...or ,其否定是both...and.../ 如果否定A,怎么解释口服无效?

恳求指正

我选B.抛开Zinc(因为最后argument重心几乎与Zinc无关,是通过两种Zinc的服用效果来强调病毒聚集地),口服其他药是否缩短病期.如果无效,则支持原结论; 如果有效,则反驳原文.