按要求改写句子。

1.This is my friend (改写为复数句) 

                     our         .

2. She is my aunt. (改写为一般疑问句并作肯定回答)

                                 aunt?          ,                   .

3. These are her brothers.(改写为否定句)

                      her         .

4.Those are my mother's brothers. (改写为同义句)

                      my         .

5.They are her friends. (就画线部分提问)

                              ?

简述超级市场的经营特征和主要优势。