题目

She is so fat that she has made up her mind to go on a b_________ diet to lose weight. 答案：balanced某化合物在纯氧中燃烧，生成CO2和SO2，则该化合物中一定含有的元素是（　　）A．氧元素和碳元素B．碳元素和硫元素C．氢元素和硫元素D．硫元素和氧元素