政府計畫興建一條快速道路，規畫的路線如圖(二)所示。道路沿線有山地及河流阻隔，因此經過河谷需興建橋梁，遇到山脊則需開挖隧道，以求最短距離。根據圖(二)的等高線判斷，甲、乙、丙三個路段需興建的項目

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4. 政府計畫興建一條快速道路，規畫的路線如圖(二)所示。道路沿線有山地及河流阻隔，因此經過河谷需興建橋梁，遇到山脊則需開挖隧道，以求最短距離。根據圖(二)的等高線判斷，甲、乙、丙三個路段需興建的項目，依序為下列何者？

(A)橋梁-隧道-橋梁
(B)隧道-橋梁-隧道
(C)隧道-隧道-橋梁
(D)橋梁-橋梁-隧道

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