单项选择题 MA I want to burn these lectures onto one CD，but I’m having trouble doing it.I keep getting an error message.WA Have you checked all the settings on your software program？MA I did，but it’s the first time I’ve used this software and maybe I missed something.WA Let me take a look...Okay，here’s the problem...You had the wrong box checked for the file-type.You need to mark the box that says ’MP-three.’Try copying again，it should work this time.What does the man want to do？（）

单项选择题 患者男，经常周期性上腹痛3年，空腹发作，夜间更重，进食可缓解，服西米替丁可止痛最可能的诊断是（ ）

单项选择题 男性，40岁，体重60公斤，因食管癌进食困难1月余。主诉乏力，极度口渴，尿少而色深。检查血压、体温均正常，眼窝凹陷，唇、舌干燥，皮肤弹性差。该病人的水、电解质失衡诊断为（ ）