2. 外语
  3. Hoof-and-mouth disease was eliminated in the United States by slaughtering affected herds of cattle.

Hoof-and-mouth disease was eliminated in the United States by slaughtering affected herds of cattle.

admin2010-01-13  37
问题 Hoof-and-mouth disease was eliminated in the United States by slaughtering affected herds of cattle.
选项 A、isolating
B、testing
C、vaccinating
D、killing
答案D
解析
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