The nice handbag is my ____ (mother).

工交车上，一位白发老人断然谢绝了年轻人的让座，他说：“你们上班辛苦，我站会儿就好。”这一幕被众多网友纷纷转发点赞。老人之所以被纷纷点赞，是因为他（    ）

已知实数a，b满足2a²﹣5lna﹣b=0，c∈R，则$\sqrt{{\left(a-c\right)}^2+{\left(b+c\right)}^2}$的最小值为（　　）

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改 10处，多者（从第11处起）不计分

    When I was at middle school, I have a nice classmate, that was the first foreigner I had ever met. She was friendly and very pretty. She was good in three languages, although he was born in China. It was interested that her father was a Frenchman while her mother came from England. All of them were teaching at a university at that time. She was crazy collecting stamps, listening to pop music, as well as playing the football. Her dream was to be an engineer, so she usually studied harder to achieve it. She often told funny stories in English to make us laughing. We all liked her.

如果若干个函数的图象经过平移后能够重合，则称这些函数为“互为生成函数”。给出下列函数①$f\left(x\right)=\sin x-\cos x$；②$f\left(x\right)=\sqrt{2}(\sin x+\cos x)$；③$f\left(x\right)=\sqrt{2}\sin x+2$；④$f\left(x\right)=\sin x$其中“互为生成函数”的是（ ）