(?)是鸡新城疫病的主要的传染来源。A．污染的饲料B．污水C．病鸡D．病鸭E．污染的空气

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问题 (?)是鸡新城疫病的主要的传染来源。

选项 A．污染的饲料 B．污水 C．病鸡 D．病鸭 E．污染的空气

答案 C

解析

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