在一栏待宰的100头牲猪中发现有一头患有口蹄疫,其正确的处理方法是()
A.立即隔离病猪
B.立即宰杀病猪
C.立即给健康猪预防注射
D.立即宰杀整栏猪
E.立即治疗病猪
参考答案:D
Man must keep in mind that it will be years ________ the earth recovers from the damage he makes to it.[ ]
A.when
B.before
C.since
D.until