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  3. PASSAGE FOUR What is the "gold standard" used to test according to the passage?

PASSAGE FOUR What is the "gold standard" used to test according to the passage?

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问题 PASSAGE FOUR
What is the "gold standard" used to test according to the passage?
选项
答案A mad cow disease．
解析 从原文第1段即可得出the“gold standard”是用来检测疯牛病的：尽管美国“黄金标准”检测说一头在11月被屠宰的牛没得疯牛病，在英国的检测却确证它患了此病。可见答案为A mad cow disease。
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