单选题：Food-poisoning may pose a problem ___________ .

题目分类：理工类
题目类型：单选题
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题目内容：

Food-poisoning may pose a problem ___________ . A．when your plane is about to land
B．when you are taking tablets
C．when you suffer from food-poisoning
D．when you are travelling
E．when you are packing for your tour
F．when you are having a cold

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答案解析：

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