有如下Visual Basic程序段：
Dim a(1 To 7) As Integer, i As Integer, j As Integer, k As Integer, c As Integer
a(1) =" 3:" a(2) =" 9:" a(3) =" 1:" a(4) =" 5:" a(5) =" 8:" a(6) =" 6:" a(2) = 2
s = ""
For i =" 1" To 3
For j =" i" + 1 To 7
If a(j) < a(i) Then
k =" a(j):" a(j) =" a(i):" a(i) = k
c =" c" + 1
End If
Next j
s =" Str(a(i))" + s
Next i
text1.Text =" Str(c)" & “:” & s
该程序段运行后,文本框Text1中显示的内容是

A．5:6 8 9

B．3: 9 8 6

C．3:1 2 3

D．5:3 2 1

在VB中，若i=3，j=4，则执行下列语句的结果是  (    )
Print “i*j=”; i*j

A．i*j=12

B．3*4=12

C．i*j=i*j

D．12= i*j

表达式“ 5 + 2 =" 7" or not 7- 4 < 3 or 6 =" 6" and 7 <> 7 ”的值为：_________。

下列VB表达式的值等于23的是(　　)

A．Str(20) + “3”	B．Val(“-20”) + 20
C．Len(“-20”) + 20	D．Abs(Int（-23.3）)

在VB中，若a=10，b=15，则语句print  a；"+"；b；"="，a+b的结果为（   ）

A．a+b=25

B．10+15=25

C．a+b= 25

D．10+15=    25