【1.】I'm Mary. I have a friend. Her name's Sally. She's clever and helpful. We are both eleven. Our birthdays are both in May. We're in the same class. We like each other. We're good friends.

【2.】We both live far from school. We live in different streets. We both go to school by bus. We both have lunch at school. We both like fish. She often shares (分享）her lunch with me.

【3.】We both like playing games. We often play games together at the weekend. She is good at playing games.

【4.】We both like dolls. Because they are soft and nice. But we like different colours. I like pink and Sally like white. I have a pink doll and she has a white doll.

正方形ABCD中，将一个直角三角板的直角顶点与点A重合，一条直角边与边BC交于点E（点E不与点B和点C重合），另一条直角边与边CD的延长线交于点F．

（1）如图①，求证：AE=AF；

（2）如图②，此直角三角板有一个角是45°，它的斜边MN与边CD交于G，且点G是斜边MN的中点，连接EG，求证：EG=BE+DG；

（3）在（2）的条件下，如果$\frac{AB}{GF}$=$\frac{6}{5}$，那么点G是否一定是边CD的中点？请说明你的理由

小明通过互联网购买了一双名牌运动鞋，付款后试穿发现质量存在问题，属伪劣产品。这时，他可采取的正确做法是（    ）

①与网购公司有关人员协商解决   ②向有关部门投诉

③请求消费者协会调解解决         ④不去追究，另外购买一双