第20题: [单项选择]According to the passage, the key to successful weight reduction is to ______. A. expend the same amount of calorie as in taking B. do many types of physical activities C. exercise regularly D. pay attention to diet 参考答案:C 答案解析:细节推断题。根据文章所说but the key to successful weight reduction is to exercise regularly,成功的减轻体重最重要的是有规律的锻炼,因