Question

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

A. researchB. exerciseC. operations

Answer 1

【答案】A

【解析】

句意：山姆正在研究古丝绸之路。A. research研究；B. exercise练习；C. operations手术。根据the ancient Silk Road古丝绸之路。可知，山姆是正在研究古丝绸之路。因此选择research研究；故选A。