题目

Jay is familiar __________ music and he is familiar ______young fans. A．to；with                     B．with；to C．with；with                   D．to；to 答案：B下列化学反应属于置换反应的是（　　）A．CO+CuO 加热 . Cu+CO2B．Cl2+H2O=HCl+HClOC．Na2O+HCl=2NaCl+H2OD．C+H2O 高温 . H2+CO