This is a new ______ to language teaching, which can stimulate students’ interest to learn the language. A. approach B. means C. method D. way 答案:A 解析: 略在氢气、氧气、甲烷、一氧化碳、二氧化碳等五种气体中选择适当的物质(用化学式表示)填空:有剧毒的气体_______;能灭火的气体_______;能支持燃烧的气体______;能冶炼金属的气体是________;天然气和沼气的主要成分是_______。