断流手术的目的是（）
A.减缓肝衰竭
B.预防肝癌
C.预防或控制上消化道出血
D.增强抵抗力
E.消除腹水
参考答案：C
恩氟烷的最终代谢产物是（）
A.三氟乙酸
B.无机氟
C.乙醇胺
D.六氟异丙醇
E.三氟乙酸+无机氟
He hardly had anything to eat, （） he
A. didn't
B. hadn't
C. had
D. did
