面颊部软组织出血时，若采用压迫止血，应该压迫的动脉是（）
A.上、下唇动脉
B.面动脉
C.上颌动脉
D.舌动脉
E.耳后动脉
参考答案：B
— Just now Jenny gave ten dollars to a person in trouble.
— She _________ others. [ ]
A. was always helping
B. is always helping
C. always helped
D. had always helped
引起伤寒不断传播及流行的主要传染源是（）。
A.潜伏末期病人
B.极期病人
C.恢复期带菌者
D.慢性带菌者
E.恢复期病人
