题目

设U为全集，对集合X，Y，定义运算“”，XY＝  (X∩Y)．对于任意集合X，Y，Z，则( XY )Z＝ (A) (X∪Y)∩  Z   (B) (X∩Y)∪  Z    (C) (   X∪  Y )∩Z   (D) (   X∩  Y )∪Z 答案：B阅读短文，判断正(T)误(F)。Hello! My name is Xiaoming. I have a small dog. It's yellow. It is my friend. It has small eyes and small ears. And it has a short tail. It's so cute.【1】Xiaoming has a panda. （_____）【2】The dog is Xiaoming's friend. （_____）【3】The dog has big eyes. （_____）【4】The dog has a long tail. （_____）【5】The dog is cute. （_____）