题目

“My kids really understand solar and earth-heat energy,” says a second-grade teacher in Saugus, California. “Some of them are building solar collectors for their energy course.” These young scientists are part of City Building Educational Program (CBEP), a particular program for kindergarten through twelfth grade that uses the stages of city planning to teach basic reading, writing and math skills, and more. The children don't just plan any city. They map and analyze the housing, energy, and transportation requirements of their own district and predict its needs in 100 years. Wi32小时：25分的最简整数比是______，比值是______．