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?
A. Whether zinc is effective only against colds, or also has an effect on other virally caused diseases
B. Whether there are remedies that do not contain zinc but that, when taken orally, can reduce the duration of colds
C. Whether people who frequently catch colds have a zinc deficiency
D. Whether either the zinc gel or the lozenges contain ingredients that have an impact on the activity of the zinc
E. Whether the zinc gel has an effect on the severity of cold symptoms, as well as on their duration
老题目了,不过有争议,看了以前的贴子答案的争议在BD之间.
我本来选D,但是现在觉得B是对的.
D有一个很大缺陷即文章中并没有说明ZINC对COLD的影响,即是否是ZINC的ACTIVITY影响了COLD的时间(所以有可能是这两个都含ZINC的东西里都有另一种东西影响COLD).所以D回答YES或NO都不能起到加强或者削弱的作用.
相反B只是针对VIRUS本身的部位(重点是用的是同一种药)PLUS结论句的讨论点也在MOUTH和NOSE间,所以是最佳答案.
欢迎指正. | 
