题目

—What do you want those old boxes? —To put things in when I move to the new flat． A．by B．for C．of D．with 答案：C 已知全集U＝{0，1，2}，且Q＝{2}，则集合Q的真子集共有 [　　] A． 3个 B． 4个 C． 5个 D． 6个