“十一”黄金周，小张出游时购买了20元旅游保险。对小张而言，这种购买保险的行为属于[ ]
A、存款储蓄行为
B、投资行为
C、交换行为
D、生产行为
答案：B
He was dismissed because his attitude towards his work was rather________. [ ]
A. eager
B. delicate
C. changeable
D. casual
口底及下颌的急性蜂窝织炎危及生命的并发症是（）。
A.颅内化脓性海绵状静脉窦炎
B.喉头水肿，压迫气管，呼吸困难，窒息
C.纵隔化脓感染
D.化脓性心包炎
E.脓毒症
