题目

下列VB程序段的功能为：生成n个不重复的随机整数，保存在数组a中，并升序排序。 Const n = 6 Dim a(1 To n) As Integer, f(1 To 10) As Boolean Dim tmp As Integer, i As Integer, j As Integer, t As Integer ‘f数组各元素的初值置为False，代码略 For i = 1 To   ⑴      t = Int(1 + Rnd * 10)     If Not f(t) Then         a(i) = t : f(t) = True         For j =   ⑵              If a(j) < a(j - 1) Then                 tmp = a(j): a(j) = a(j - 1): a(j - 1) = tmp             End If         Next j     Else       ⑶      End If Next i 上述程序段3个方框处的表达式分别为(   ) A . （1）n - 1 （2）2 to i（3）i = i - 1 B . （1）n（2）i to 2 Step -1（3）i = i - 1 C . （1）n - 1（2）2 to i（3）t = Int(1 + Rnd * 10) D . （1）n（2）i to 2 Step -1（3）t = Int(1 + Rnd * 10) 答案：B

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