It was in the remote mountain areas ______ I spent the gap year ______ I learned how to work with a group of strangers and how to look after myself．

A．when; that

B．where; that

C．where; when

D．that; where

[复合型非选择题]女，72岁，软弱无力，进食减少，口渴、多尿3周，近2天嗜睡。急诊检查：BP80/60mmHg，神志朦胧，皮肤干燥失水，呼吸34次／分，心率108次／分，尿糖（++++），尿酮（±）。既往无糖尿病史。

为明确诊断，除血糖测定外，首选的检查是（）

A.血电解质+BUN、Cr

B.糖基化血红蛋白+BUN、Cr

C.血气分析+BUN、Cr

D.血酮体+血气分析

E.血乳酸+血气分析