Direction: For this part you are allowed 30 minutes to write a composition on the topic :Cell Phones .You should write no less than 120 words and base your composition on the outline below:

1、描述上图所示的手机用户数的变化情况

2、出现这种情况的原因

3、对此现象作出评价

下面程序的功能是把文件file1.txt中重复字符去掉后(即若干多个字符相同，则只保留一个)写入文件file2.txt。请填空。
Private Sub Command1_Click()
Dim inchar As String, temp As String, outchar As String
outchar=""
Open"filel.txt" For Input As#1
Open"file2.txt" For Input As# (12)
n=LOF( (13) )
inchar=Input $ (n，1)
For k=1 To n
temp=Mid(inchar,k,1)
If InStr(outchar, temp)= (14) Then
outchar=outchar＆temp
End If
Next k
Print #2， (15)
Close#2
Close#1
End Sub