患者女，30岁，全麻下骶骨瘤切除术后第1天，术中出血8000ml，尿量50ml/24h，血肌酐450μmol/L，尿素氮30mmol/L，转入ICU，诊断为急性肾衰竭。

急性肾衰竭的常见致死原因是（）

A.低钠血症

B.高钾血症

C.代谢性碱中毒

D.高渗性脱水

E.低氯血症

—_____ the pants?

—They're 15 yuan. 　　 [ ]

A. How many is

B. How many are 　　

C. How much is

D. How much are