题目

阅读理解 Children across the world are taking pictures of their school meals. They are sending these pictures over the Internet to a young girl in Scotland. Then she shares the pictures and stories with people around the world. The girl's name is Martha. She likes to write. So Martha decided to start her own blog. Every day, Martha writes on the Internet about the meals she eats at school. She also takes pictures of the food. Martha is very honest about the food. She does not just describe the food. She judges (评价) the taste of the food. She also judges how healthy the food is. Sometim 数轴上到原点的距离为2的点所表示的数是________．