设全集U={1,2,3,4}，则集合A="{1," 3}，则C_UA=（  ）

A．{1, 4}             B．{2, 4}             C．{3, 4}             D．{2, 3}

设全集U={1,2,3,4}，则集合A="{1," 3}，则C_UA=（  ）

设全集U={1,2,3,4}，则集合A={1, 3}，则CUA=

1. A.
   {1, 4}
2. B.
   {2, 4}
3. C.
   {3, 4}
4. D.
   {2, 3}

A.                 B.{2,4,7,8}               C.{1,3,5,6}               D.{2,4,6,8}