题目

如果数组a(下标1到n)满足a(1)≤a(2)≤…≤a(i-1)≤a(i)≥a(i+1)≥…≥a(n),则称数组a是单峰的,并称a(i)是数组a的“峰顶”。下列程序段用于查找数组a中的“峰顶”,并返回该“峰顶”值。 Dim a(1 To 10) As Integer Function Search(L As Integer, R As Integer) As Integer  M = (L + R) \ 2  If a(M) < a(M - 1) And a(M) > a(M + 1) Then      ⑴    ElseIf a(M) > a(M - 1) And a(M) > a(M + 1) Then      ⑵    ElseIf a(M) > a(M - 1) And a(M) < a(M + 1) Then     ⑶    End If End Function Private Sub Command1_Click()  Label1.Caption = "“峰顶”值是:" + Str(Search(1, 10)) End Sub 上述程序中划线处可选语句为: ①Search = Search(M + 1 , R) ②Search = Search(L , M - 1) ③Search = a(M) 则(1)(2)(3)处的语句依次是（  ） A . ①②③ B . ①③② C . ③①② D . ②③① 答案：D

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