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  3. PASSAGE FOUR What has slowly become apparent about the common cold?

PASSAGE FOUR What has slowly become apparent about the common cold?

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问题 PASSAGE FOUR
What has slowly become apparent about the common cold?
选项
答案It is a large group of similar diseases.
解析 根据题目中的slowly become apparent和the common cold定位到第2段。该段提到有关普通感冒的事实逐渐变得显而易见：普通感冒并非单一疾病，而是由50—100种不同微生物引起的疾病群(not a diseasebut a large group of similar diseases…)。答案可沿用文章原词填写，但由于答案字数不得超过10个。此处可将答案精简为It is a large group of similar diseases。
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