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Questions 21～24 are based on the following news from the BBC or the VOA. At the end of the news item, you will be given 20 seconds to answer the two questions. Now listen to the news. According to the passage, before the agreement was announced Monday, the two sides had been bargaining for ______days.

A. 4
B. 5
C. 6
D. 7

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有如下函数过程: Function lj(x As Integer) As Long Dim s As Long Dim i As Integer s=0 For i = 1 To x s=s+ i Next i 1j= s End Function在窗体上添加一个命令按钮，名为Command1, 编写事件过程调用该函数： Private Sub Command1 Click() Dim i As Integer Dim sum As Long For i = 1 To 5 sum = sum + 1j(i) Next i Print sum End Sub

A. 25
B. 35
C. 45
D. 55

已知A=(α1，α2，α3，α4)是4阶矩阵，α1，α2，α3，α4是4维列向量，若方程组Ax=β的通解是(1，2，2，1)T+k(1，-2，4，0)T，又B=(α3，α2，α1，β-α4)，求方程组Bx=α1-α2的通解．

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