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?

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

The answer is D. I don't think it is right. I think the answer should be B.

我来帮你顶

我的答案也是b

在哪讨论过? 题号是不是不一样啊?谁能帮我连下下  谢谢~~~

对这道题还是有疑问。请问还有其他朋友有看法么？

zinc gel已经证明是有效的了  为什么还要研究它里面是不是有影响zinc的东西？ 如果它里面有的话 就是说是说降低了药效  那么为什么还起作用呢？

这道题很不懂