下图是某流域地质简图，甲、乙、丙三地有砾石堆积物（见图右下角

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下图是某流域地质简图，甲、乙、丙三地有砾石堆积物（见图右下角照片），在甲地砾石堆积物中发现了金刚石。读图回答下列问题。

含金刚石堆积物的成因是

A．冰川沉积	B．流水沉积
C．风力沉积	D．风化残积

图中可能找到金刚石矿的地点是

A．①

B．②

C．③

D．④

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