2014
高考英语完形填空巩固练习精品题（17）及答案 (2012•郑州第一次质量预测) looking for a new weight loss plan？try living on the top of a mountain.mountain air contains less oxygen than air at lower altitudes，so breathing it causes the heart to beat faster and the body to burn more energy.studies have found that athletes training at high altitudes tend to lose weight.doctor florian lippl in germany wondered how the mountain air would affect obese individuals if they weren't doing any more physical activity than usual. lippl and his colleagues invited 20 obese m
