题目内容

【题目】Sam is doing someabout the ancient Silk Road．（　　）
A.exercise
B.operations
C.research
D.experiments

【答案】C
【解析】exercise练习；operations手术；research研究；experiments实验．根据Sam is doing some about the ancient Silk Road．可知Sam正在研究古代丝绸之路．故选C．

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