在窗体上画一个名为Command1的命令按钮。下列程序的功能是：从输入对话框输入一个正整数n。用随机函数产生n个1～100范围的随机数，然后求出去掉一个最大数和最小数的平均数。根据题意，请完善下列程序：
Private Sub Command1_Click()
Dim ave As Single, max As Integer, i As Integer, n As Integer
Dim min As Integer, Sum As Integer, s As String
Dim t As Integer
s=InputBox("输入一个正整数: ")
n=Val(s)
If n＞0 Then
max=n: min=n: Sum=0
For j=1 To n
t=【11】
print t;
Sum=Sum+t
If t＜min Then
min=t
ElseIf max＜t Then
max=t
End If
Next j
【12】
ave=Sum/n
MsgBox"平均值="+Str(ave)，，"去掉最大数和最小数后"
End If
End Sub

It is clear that some chemicals can damage the health of animals and humans. (1) , this is not the only problem that (2) be caused by the careless use of chemicals. Chemicals can also (3) the ecological balance of the environment. If the ecological balance is disturbed, the results can be (4) serious.

The (5) of DDT illustrates the problem. DDT, a chemical which kills insects, at first seemed to be a perfect answer (6) many problems. It would control insects that caused dangerous diseases, (7) insects that caused billions of dollars of damage to crops every year. Governments permitted and even (8) the use of DDT. Farmers in many countries (9) to spray it on their crops. The (10) results were good: Damage to crops (11) down, and profits went up. However, the chemical had effects which the scientists didn’t see in (12) . First, it also killed insects which were the (13) enemies of the harmful insects and which were therefore beneficial to farmers. Second, and perhaps worse, DDT did not kill (14) harmful insect. A few insects had natural resistance to the chemical. They (15) and reproduced in large numbers. In a few years there were large numbers of insects which were not (16) by DDT, and there were (17) insects which could act as natural (18) on these new "super-insects". Finally, it became clear that DDT was not solving the insect problem. In fact, it was making the problem worse. It (19) became necessary to find a second (20) for the effects of the first.

10（）

A.fast 

B.immediate 

C.moment 

D.last