单选题：Why are people advised not to travel to Mexico?

题目分类：公共英语四级
题目类型：单选题
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题目内容：

Why are people advised not to travel to Mexico? A．Because it is the most serious area for the outbreak of swine flu．
B．Because a travel ban to the country has been ordered．
C．Because more than l00 cases of swine flu have been reported．
D．The Centers for Disease Control and Prevention forbids doing so．

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答案解析：

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