切口疝最常见的发病原因是（）
A.营养不良
B.切口感染
C.切口血肿
D.术后咳嗽、腹胀
E.放置引流物时间过长
参考答案：B
A fridge is used to keep food which goes _____ very _____.[ ]
A. badly; quick
B. bad; quickly
C. badly; slow
D. bad; slowly
