题目

     everyone can hear the speaker there is no      of turning up the radio. Now that; point  B. Even if; point  C. Now that; need  D. Even if; need 答案：A下列4组物质均有一种物质的类别与其它3种不同，请选出．A．CaO、Na2O、CO2、CuOB．豆浆、淀粉溶液、石灰乳、雾C．Na、Fe、Cu、ZnD．HCl、HClO4、H2SO4、HNO3A ；  B ；   C ；  D ．