题目

阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。Have you ever heard ofagritourism(农业旅游) through which you can experience farm life? Ifnot, Dr. Cindy Ayers Elliott will tell you the real story of Foot Print Farms. The original concept ofbuilding Foot Print Farms was simple. When Cindy Ayers Elliott returned to her hometownafter graduation, she didn't have to look any further than her state's alarminghealth statistics to find a mission. Everywhere she went, there were reports ofhigh blood pressure, diabetes, obesity and heart disease. The probl一个九位数，最高位和最低位都是5，万位上是1，其他数位都是0，这个数是500010005500010005．