Jason has been preparing carefully for his English examination so that he could be sure of passing it at his first_________ .

A．purpose

B．desire

C．attempt

D．intention

女性，53岁。体胖，平素食欲佳，近1个月饮水量逐渐增多，每日1500ml左右，尿量多，空腹血糖6.7mmol/L，尿糖+1。 

应做的检查来确诊糖尿病的是（）

A.24小时尿糖定量 

B.24小时尿蛋白定量 

C.血、尿C肽测定 

D.血胰岛素释放试验 

E.葡萄糖耐量试验 

F.糖化血红蛋白测定