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

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

【答案】C

【解析】句意: 山姆正在研究古代絲綢之路。本題考查名詞辨析。A. exercise 練習(xí) ; B. operations 操作 ; C. research.研究 ; D. experiments實(shí)驗(yàn)。結(jié)合句意和語境可知選C。

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