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

【答案】C
【解析】exercise練習;operations手術(shù);research研究;experiments實驗.根據(jù)Sam is doing some about the ancient Silk Road.可知Sam正在研究古代絲綢之路.故選C.

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