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  3. PASSAGE FOUR What is the most possible reason for mad cow disease?

PASSAGE FOUR What is the most possible reason for mad cow disease?

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问题 PASSAGE FOUR
What is the most possible reason for mad cow disease?
选项
答案Cow’s infected feed．
解析 解答此题的关键在原文的第12段。从该段中我们可以了解到疯牛身上感染的病毒有可能来自从法国进口的被感染的饲料，所以答案为Cow’s infected feed。
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