题目

Millions of children are considered fat in the United States. And these children are at greater risk of bone and joint(关节) problems, and poor self-confidence. While the government is working on programs to stop this trend, experts stress that prevention should start at home.     The first step to a healthy home is to simplify your shopping list, Mary Jones Verbovski, a pediatric dietitian(儿科营养学家)at Seattle Children’s Hospital, recommends fresh milk products, meats and vegetables——the brighter, the better. “Look for naturally colorful foods,” she said. “Mor工程队修一条长34千米的道路．第一天修了全长的14，第二天修了全长的13．还剩全长的几分之几没有修？