How did mad cow disease spread and cause cattle to die?

admin2012-01-16 25

问题 How did mad cow disease spread and cause cattle to die?

选项 A、By using MBM (meat-and-bone meal) with different plants.
B、By eating infected (感染的) MBM.
C、By importing foreign cattle.

答案B

解析

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公共英语二级笔试

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