1. (2021高二下·温州期中) 执行该程序段后，Text1显示的是(      )

a(1) = 1: a(2) = 3: a(3) = 7: a(4) = 5: a(5) = 4

s = "PRE2021reform": t = 0

For i = 1 To 5

    If a(i) >= t Then t = a(i)

    s = Mid(s, 1, t - 1) + Mid(s, t + 1)

Next i

Text1.Text = s