题目

某3克醛和足量的银氨溶液反应，结果析出43.2克Ag，则该醛为（  ） A．甲醛             B．乙醛         C．丙醛         D．丁醛 答案：A 解析: 略—Tom, I'll invite you to have ________ lunch after playing ________ violin.—Thank you.A.a; the B.the; theC./; / D./; the