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设全集是实数集R,M={x|x≤1+,x∈R},N={1,2,3,4},则RM∩N等于( )
A.{4} B.{3,4}
C.{2,3,4} D.{1,2,3,4}
A.{4} B.{3,4} C.{2,3,4} D.{1,2,3,4}