请教GWD 29-27

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?

1. Whether zinc is effective only against colds, or also has an effect on other 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

C,E哪个对?

CE是无关项.只有D把这个问题说清了.楼主再看看文章吧.

先把文章读懂再看选项.

哦,问错了。..

晕

是B对什么不对啊

在BD中徘徊许久

B也是无关项.因为文章比较的两个都含zinc的.只是用法不同.

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

有或是没有都不能评价文章说的事实.

问一下

原文的结论是

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

还是

the fact that cold viruses tend to concentrate in the nose, not the mouth

如果是后者,是不是BD都可以?

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

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.

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

如果是YES, 就是说这两种药因为有其它的东东引起了药效不一样,那么就不能说cold viruses tend to concentrate in the nose, not the mouth.

如果是NO,那就是两种药因药效一样,是可以说cold viruses tend to concentrate in the nose, not the mouth.

因此D是可以evaluate原文.

明白了，谢谢斑竹！