题目

阅读理解；阅读下列短文，从每题所给的四个选项 A、B、C、D中选出最佳选项。 Recently a Beijing father sent in a question at an Internet forum(论坛) asking what “PK” meant. “My family has been watching the ‘I Am the Singer’ singing competition TV programme. My little daughter asked me what ‘PK’ meant, but I had no idea,” explained the puzzled father. To a lot of Chinese young people who have been playing games online, it is impossible not to know this term. In such Internet games, “PK” is short for “Player Kill”, in which two players 图中阴影部分表示的集合是(     ) A. A∩(CUB)        B.(CUA)∩B        C.CU(A∩B)    D. CU (A∪B)