Mineral exploration during the 1960s and early 1970s led to the discovery of a large deposit of _____ at Navan in northeast Ireland.
A、copper ore
B、iron ore
C、gold ore
D、zinc ore
【正确答案】：D
【题目解析】：
答案选D。Mineral exploration during the 1960s and early 1970s led to the discovery of a large deposit of zinc ore at Navan in northeast Ireland.参见教材P351。
