题干
通常情况下，物质存在的状态是____、____和____。平时我们见到的铁是____态；酒精是____态；氧气是____态；
答案(点此获取答案解析）
固态,液态,气态,固,液,气
to explain so much about this theory to Peter. _______ , he is clever enough to understand it .