According to the passage, CDC is an organization that We can learn from the fourth paragraph that

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问题 According to the passage, CDC is an organization that
We can learn from the fourth paragraph that

选项 A、students are easily attacked by the Norwalk-like virus.
B、Norwalk-like viruses tend to break out in closed crowded place.
C、Norwalk-like viruses might cause flu.
D、Norwalk-like viruses are not widespread.

答案B

解析 事实细节题。第四段首句they(Norwalk-like viruses)tend to break out whenever people congregate in close quarters是答案选项的同义转述,故该项为答案。
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