种牛的主要检疫疫病有（）。
A、口蹄疫
B、结核
C、疯牛病
D、布鲁氏菌病
参考答案：A, B, C
Jeff goes to work _______and his wife goes to work_______[ ]
A．by car; on her bike
B．by a car; on her bike
C．by car; by bikes
D．by his car; by her bike
外吹乳痈最常见的原因是（）
A.乳汁郁积
B.七情不畅
C.感受外邪
D.乳晕部感染
E. * * 破碎
