已知x = [1, 2]和y = [3, 4],那么x+y的结果是? A.[1, 2, 3, 4] B.[4, 6] C.3 D.7 已知x = [1, 2]和y = [3, 4],那么x+y的结果是? A.[1, 2, 3, 4] B.[4, 6] C.3 D.7 正确答案:A