问题详情:已知全集U={1,2,3,4,5,6,7},*A={1,3,5,6},则 ( ) A.{1,3,5,6} B.{2,3,7} C.{2,4,7} D.{2,5,7}【回答】C知识点:*与函数的概念题型:选择题