A:***诞生
B:红军长征胜利
C:抗日战争胜利
D:中华人民共和国的成立
The little pupil took his grandma ____ the arm and walked her across the street.
甲.乙.丙三个事件发生的概率分别为0.5,0.1,0.9,它们各与下面的哪句话相配.