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

A. researchB. operationsC. exerciseD. experiments

【答案】A

【解析】

句意：山姆正在研究古絲綢之路�？疾槊~辨析。A. research研究， 調(diào)查；B. operations手術(shù)；C. exercise鍛煉，運(yùn)動(dòng)；D. experiments實(shí)驗(yàn)， 試驗(yàn)。結(jié)合句意可知填research；選項(xiàng)A。

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