How did mad cow disease spread and cause cattle to die?A、By using MBM (meat-and-

游客2025-07-26 0

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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