题目

– Hello! Who's that?– This is Mary. I'd like to to Andy about tomorrow's trip.A. saying; say B. speaking; tell C. speaking; talk D. saying; speak 答案：【答案】C【解析】试题句意：－你好，你是谁？－－我是玛丽，我想给Andy 谈谈明天旅行的事情。Who’s that speaking ?是打电话时的专用语，询问对方是谁。Tell sb to do sth 告诉某人做某事，但不能用tell to。结合语境故选C。工业上常用乙炔燃烧产生的高温火焰来切割金属．若用R表示乙炔，其燃烧的化学方程式：2R+5O24CO2+2H2O，则乙炔的化学式是（ ）A．C2H4B．C2H2C．CH3COOHD．C2H6