Zhongdian is 659 kilometers away from Kunming, and there are ______ flights between the two cities.[ ]

A. usual

B. extraordinary

C. regular

D. common

简要病史：男性，45岁，消瘦、多尿半个月要求：你作为住院医师，按照标准住院病例要求，围绕以上主诉，请叙述应如何询问该患者现病史及相关的内容诊断：糖尿病