①A∪B={1,2,3,4,5,6,7};②A∩B=∅;③A中的元素个数不是A中的元素;④B中的元素个数不是B中的元素.
若集合A含有2个元素,则满足条件的A有____个.
词语释义选出与句子中划线部分意义最接近的选项。—Today, many young people look up to those famous basketball players. —Yes.They are heroes in the eyes of young people.