题目

阅读理解 According to a recent report, about 15% of the people in theUK are members of gyms. But are they more likely to be fit? A study found that gym members were 14 times more activethan people who didn't belong to any health club. Gym members did six hoursmore exercise a week, and this activity did make them fitter than non-gymmembers. They also spent less time sitting down every day than non-gym members.The results were the same for men and women. The study included 405 people between the ages of 30 and 64,and the main characteristics of those who were gym members were the same asthos18．表中对于相关物质的分类全部正确的一组是（　　）编号纯净物混合物碱性氧化物非电解质A液氯漂白粉Al2O3COB纯碱浓硫酸CaO乙醇C碱石灰王水K2OCl2D胆矾水玻璃Na2O2SO2A．AB．BC．CD．D