—He asked her_________the bag because it

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问题选择题

—He asked her_________the bag because it was too expensive．

A．not to buy

B．to buy not

C．not buying

D．not buy

答案

答案：A

考查非谓语动词的用法。固定结构ask …to do sth“请求…做某事”、 ask …not to do sth“请求…不要做某事”，此处使用不定式的否定结构，直接在不定式前加not。

单项选择题

为防止催化剂堵塞反应器旋风分离器料腿，通常反应器旋风分离器设置了（）。

A、反吹风

B、翼阀

C、集气室

D、导向挡板

填空题

执行下面程序,单击按钮CmdRun,窗体上显示的第一行结果是（）,UBound(a)的值为（）,其中a(1)的值为（）.

Option Explicit

Private Sub CmdRun_Click()

Dim St As String,i As Integer

Dim a() As String,j As Integer,k As Integer

St="abcd"

Call Sub1(St)

Print St

For i=1 To Len(St)

For j=i+1 To Len(St)

If Mid(St,i,1)=Mid(St,j,1) Then Exit For

Next j

If j>Len(St) Then

k=k+1

ReDim Preserve a(k)

a(k)=Mid(St,i,1)

Print "a(";k;")=";a(k)

End If

Next i

End Sub

Private Sub Sub1(S As String)

Dim i As Integer

For i=1 To Len(S)\2

Mid(S,i,1)=Mid(S,Len(S)-i+1,1)

Next i

End Sub