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标题: 问PREP模考一题 [打印本页]

作者: evelyn205205 时间: 2011-2-7 11:46
标题: 问PREP模考一题

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.

Which of the following, if true, most serious weakens the argument?

A. Experimental subjects who used the zinc gel not only had colds or short duration but also had less severe symptoms than did those who used a gel that did not contain zinc.

B. The mechanism by which zinc affects the viruses that cause the common cold has not been conclusively established.

C. To make them platable, xinc lozenges generally contain other ingredients, such as citric acid, that can interfere with the chemical activity of zinc.

D. No zinc-based cold remedy can have any effect unless it is taken or applied within the 48 hours of the initial onset of cold symptoms

E. Drug-company researchers experimenting with a nasal spray based on zinc have found that it has much the same effect on colds as the gel does.

ANSWER: C

这道题看过别人讨论过，但不是削弱的题型。

作者: evelyn205205 时间: 2011-2-7 20:38
谢谢各位大侠，期待你们的解释

作者: evelyn205205 时间: 2011-2-8 20:06
期待各路大侠的解答，先谢谢了

作者: evelyn205205 时间: 2011-2-9 18:01
HELP！

作者: daliancat 时间: 2011-2-10 09:45
这是一个他因削弱，及原题的逻辑是： A—B , 但是因为other ingredients 则非A—B

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