已知随机变量ξ服从正态分布N(0,σ2),若P(ξ>2)=0.023,则P(-2≤ξ≤2)=( )
A:0.477
B:0.628
C:0.954
D:0.977
精子和卵细胞相遇是在( )
September is the ____ (nine) month of a year.