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

A. researchB. exerciseC. operations

【答案】A

【解析】

句意：山姆正在研究古絲綢之路。A. research研究；B. exercise練習；C. operations手術。根據(jù)the ancient Silk Road古絲綢之路�？芍�，山姆是正在研究古絲綢之路。因此選擇research研究；故選A。

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