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【题目】Sam is doing some ______ about the ancient Silk Road.

A. exercise B. operations C. research D. experiments

【答案】C

【解析】

试题分析:句意:萨姆正在研究古代的丝绸之路。A. exercise锻炼,运动;练习题。B. operations操作;经营;手术。 C. research 研究,调查。D. experiments试验,尝试。根据the ancient Silk Road,可知在做研究,故选C。

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