1. (2019高二下·浙江期末) 有如下WB程序段：

Dim n As Integer, i As Integer, a As Integer, b As Integer

Randomize

n=5：i=1

Do While i <=n

a= Int(Rnd*90)+ 10

b= Int(Rnd*90)+ 10

If a>b Then

List1.AddItem Str(a)+"-"+ Str(b)+“=“

i=i+1

End If

Loop

执行该程序段后，下列说法正确的是（  ）