—Why were you late _____ class?            

—Because my bike broke _____ on my way to school.         [ ]

A. for; down            

B. at, off                  

C. for; up

2型糖尿病最常见的死亡原因是（）

A.糖尿病神经病变

B.糖尿病酮症酸中毒

C.心脑血管并发症

D.糖尿病肾病

E.糖尿病高渗状态