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  3. The purpose of the economists’ research at the University of Iowa is to If the CDC’s map turns all red, it means

The purpose of the economists’ research at the University of Iowa is to If the CDC’s map turns all red, it means

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问题 The purpose of the economists’ research at the University of Iowa is to
If the CDC’s map turns all red, it means
选项 A、they keep good record of the influenza eases.
B、Philip Polgreen and his colleagues are successful.
C、there is no cases of influenza.
D、there is a wide outbreak of influenza.
答案D
解析 事实细节题。根据题干中的CDC定位至第三段，该段首句指出CDC的职能：在流感发生时跟踪国内流感的病例。在此一周后，他们发布信息，部分通过利用一个色彩标志的地图。末句对地图颜色进行了解释说明：流感强度分为五级，黄色代表"流感未爆发"，红色代表"流感大范围爆发"。track influenza cases是CDC的职能，与地图颜色无关；文中没有就Philip Polgreen的实验成功与否进行评论；第三段末句明确指出黄色代表no activity。
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