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1.ÒÑÖª¼¯ºÏU={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},Ôò(?_UA)∪(?_UB)µÈÓÚ(¡¡¡¡)

A.{1,6}               

B.{4,5}               

C.{2,3,4,5,7}       

D.{1,2,3,6,7}