I live in a big city with a lot of homeless people. Luckily there're small ways of helping them and you needn't have a lot of1. One way to help is to buy their monthly magazine. 2doing this one day, I got to3a young homeless man. He was often4the magazine at the train station.

        He was a poor farmer from another country. After a while, I discovered that his5was close to mine. It6that we were born in the same month.

        I met him last year7after his birthday, and after congratulating (祝贺) him, without8， I asked if he had a good day. He9and said that he hadn't really celebrated. I felt so10.

        I just couldn't bear the thought of (不敢想) this nice, young man being11on his 25th birthday with no presents, no cake, nothing! So I went home and looked in my yarn (纱线) basket. 12for me, I had enough yarn13. I set to work and knitted (编织) a14for the young man. The yarn had become a little dirty15I didn't knit very often. Then I washed the yarn so the scarf would be16when he got it.

      I met him on my own birthday as I was going shopping. I had17to meet him so I had18the scarf and a piece of my own birthday19around with me. He was very happy with these gifts and so was I. The20in his eyes was the best present he could have given me!

①要坚持矛盾普遍性与特殊性的辩证统一

②矛盾双方既对立又统一推动事物的发展

③矛盾同一性是推动事物发展的根本动力

④矛盾主要方面和次要方面是相互依存的

已知向量$\overrightarrow{a}$、$\overrightarrow{b}$的夹角为$\frac{\mathrm{\pi }}{3}$，|$\overrightarrow{a}$|=2，|$\overrightarrow{b}$|=1，则|$\overrightarrow{a}$+$\overrightarrow{b}$||$\overrightarrow{a}$﹣$\overrightarrow{b}$|的值是____ 

1949年底召开第一次全国教育工作会议，决定建立人民教育事业：1957年***提出：  “我们的教育方针，应该使受教育者在德育、智育、体育几方面都得到发展，成为有社会主义觉悟的有文化的劳动者。”材料最能说明当时我国（    ）