不得其解得一道CR，赐教
[font="][size=9.5pt] 答案是D[/size][/font][font="][size=9.5pt][/size][/font][font="][size=9.5pt]GWD-29-Q27[/size][/font][align=left][align=left][font="][size=9.5pt]Though sucking zinc lozenges has beenpromoted as a treatment for the common cold, research has revealed noconsistent effect.
Recently, however, azinc gel applied nasally has been shown to greatly reduce the duration ofcolds.
Since the gel contains zinc inthe same form and concentration as the lozenges, the greater effectiveness ofthe gel must be due to the fact that cold viruses tend to concentrate in thenose, not the mouth.[/size][/font][/align][/align][align=left][align=left][font="][size=9.5pt]In order to evaluate the argument, itwould be most helpful to determine which of the following?[/size][/font][/align][/align][align=left][align=left][font="][size=9.5pt]A.
[/size][/font][font="][size=9.5pt]Whether zinc is effective only againstcolds, or also has an effect on other virally caused diseases[/size][/font][/align][/align][align=left][align=left][font="][size=9.5pt]B.
[/size][/font][font="][size=9.5pt]Whether there are remedies that do notcontain zinc but that, when taken orally, can reduce the duration of colds[/size][/font][/align][/align][align=left][align=left][font="][size=9.5pt]C.
[/size][/font][font="][size=9.5pt]Whether people who frequently catch coldshave a zinc deficiency[/size][/font][/align][/align][align=left][align=left][font="][size=9.5pt]D.
[/size][/font][font="][size=9.5pt]Whether either the zinc gel or the lozengescontain ingredients that have an impact on the activity of the zinc[/size][/font][/align][/align][align=left][align=left][font="][size=9.5pt]E.
[/size][/font][font="][size=9.5pt]Whether the zinc gel has an effect on theseverity of cold symptoms, as well as on their duration[/size][/font][/align][/align] 你看这里..
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