完型填空
   When I was walking down the street the other day, I happened to1a small brown purse2 on the road. I3it up and opened it to see if I could4 the owner's name. There was5 inside it6 some changes (零钱) and an old photo--a picture of a woman and a young girl of about twelve years old who looked7 the woman's daughter. I put the photo back and8 the purse to police station, 9 I handed it to an officer. Before I left, the officer took my name and address10the owner might want to write and thank me.

十八大代表、宁夏发电集团六盘山基地检修维护部主任尤天军，用其26年的钻研修成“工人教授”；十八大代表、上海外高桥谘船有限公司班组长洪刚，凭借农家子弟吃苦耐劳的劲头，成为从田埂上走出的现代产业工人。据此回答第问题。

下列关于经线的说法，正确的是（　　）