GWD-29-Q27 不理解为什么选D?

GWD-29-Q27

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

D   我选的是B

这个题目思路很清晰, 不知道楼主疑问点在哪里? 楼主在思考一下, 为什么不选D, 是否有其他迷惑项...如果真想不通, 等下给楼主一个答复...

思考过程是关键, 直接说答案没啥意思...

评价题:
题目: 1. 研究发现, 口服Zn没有持续效果; 2. 鼻腔用Zn有持续效果; 3. 口服的和鼻用的含有的Zn一样
结论: 鼻用Zn有持续效果的原因是因为病毒集中在鼻子而不是在口腔

A. Zn是否只对感冒有效.....题目讨论的是鼻子和嘴, 无关
B. 不含Zn的药物, 口服的效果...这个没有涉及到鼻子, 无关
C. 频繁感冒是否是Zn缺乏...不影响结论, 无关
E. 对重感冒是否有效, 不影响结论, 而且没有涉及嘴, 无关

D. 是否含有其他成份影响Zn的活性.
如果是, 则gel的持久效果可能是因为其他成份导致Zn活性增强, 而不是用药于鼻腔的缘故, 削弱结论
如果否, 则属于排除他因, 说明两种药物没有别的差别, 很可能是用药部位导致疗效差别, 加强结论

明白了，拨开云雾见太阳

回4楼，虽然我不认为B项有什么严重问题，但D优于B。

原文结论：G更有效是因为Virus集中在鼻子而不是嘴巴

看B选项，看一看其他的不含Z的口服疗法能不能reduce the duration of cold?

yes----说明口服也是有效的

NO---  说明口服无效---支持结论

貌似是正确答案吧？其实不是！回看原文结论，说G更有效！是比较有效的程度，而并没有说L就无效，更没有排除其他疗法无效。所以回答B选项的YES并不能削弱结论。