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  3. According to the passage, CDC is an organization that The history of Norwalk virus tells us that

According to the passage, CDC is an organization that The history of Norwalk virus tells us that

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问题 According to the passage, CDC is an organization that
The history of Norwalk virus tells us that
选项 A、it is named by CDC.
B、it caused thousands of tourists sick.
C、it is an ordinary virus.
D、it has been eradicated now.
答案C
解析 事实细节题。本文第一、二和四段都出现了Norwalk virus，一、二两段对the Norwalk virus的历史进行了回顾。第四段首句指出Norwalk-like viruses极为普通，这与答案选项内容一致，故为答案。首段末句指出科学家们将这种以前未发现的病毒命名为the Norwalk virus，命名者不是CDC；第二段首句提到船上的乘客抱怨恶心，呕吐，但并没有提到病人数字；第四段首句指出Norwalk-like viruses是紧次于感冒的最常见的病毒，只要人们聚集在一个狭小空间超过两至三天就可能爆发。
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