推论病因与疾病因果关联的标准错误的是()。
A.关联的强度
B.关联的时间性
C.关联的特异性
D.关联的可重复性
E.关联的地区性
参考答案:D
经检验合格的出口烟花爆竹,均应在运输包装明显的部位加贴验讫标志。
My mother was cooking while I________ the radio. [ ]
A. listened to
B. have listened to
C. was listening to
D. is listening to