请把下面这个长句改写为三个单句。(可增删个别词语，但不得改变原意)

已成为全体城市人的骄傲和“城市梦”的理由的2010年上海世博会主题口号“城市，让生活更美好”实际上来自古希腊最博学的学者亚里士多德。

    Nowadays, there are lots of left-behind children（留守儿童）at school, especially in the ____（贫穷）areas in China. According to report, China has 61.03 ____（million）children who have been left behind by their families. ____（lack）proper care, many of these children suffer from anxiety（焦虑）and ____（事故）.

    Some of left-behind children have ____（not see）their parents for more than a year. Some of them live with their grandparents or relatives. They feel ____（孤独）and miss their parents a lot. Every child needs ____ （parents）love and care.

    Zhi Yan, a 10-year-old girl, lives in a mountain village in ____ （west）China. She has to prepare supper for her family ____（除了）study. “Thanks to schools, governments and society's help, we live ____（happy）.” The girl said.

①H₂SO₃+I₂+H₂O═2HI+H₂SO₄

②2FeCl₃+2HI═2FeCl₂+2HCl+I₂

③3FeCl₂+4HNO₃═2FeCl₃+NO↑+2H₂O+Fe（NO₃）₃．

在直线$y=\frac{1}{2}x+\frac{1}{2}$上，且到坐标轴距离为1的点有（   ）