第34题: [单项选择]Which of the following are true of the first metal coins A. They were made of copper. B. They were made of paper. C. They were square but with a round hole in the center. D. They were round but with a square hole in the center. 参考答案:D 答案解析:[精解] 细节题。关于最早的金属钱币的描述出现在文中第三段第二句"They were round and had a square hole in the center."中,这与[D]的描述完全一致