求教GWD-TN-24-CR:38: GWD-29-Q27

38: 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

这道题给的答案是D。但貌似很不合理，D是gel和lozenges是否同时具有某种特质，而原文结论是两者区别，显然与结论的具体性不符。

个人意见应选B。Test：对B做肯定回答，则证明治疗cold的关键在口而非鼻，因此weaken.

请各路大侠指点！！！谢谢！！

谢谢大侠指教，不过还是有些地方不理解：

D.     Whether either the zinc gel or the lozenges ...意思是gel或lozenges对zinc的活性有影响，并没要求两者一定是相反的作用啊？

而且对D的直接肯定性回答是“是，有影响！”，可这并不能weaken在鼻不在口的结论啊？

此题目结论的聚焦点在cold viruses集中在nose还是mouth，不是zinc的活性是否受影响？

B中即便暂且承认remedies是无关词，但对B的肯定回答的确能对结论weaken，这又该怎么解释呢？

请大侠赐教！！！

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