下列哪些疾病的治疗首选青霉素()
A.白喉
B.钩体病
C.流脑
D.伤寒
E.霍乱
参考答案:A, B, C
The woman teacher together with her students_________going there_______.
A.are;by foot
B.is;on foot
C.are;by feet
D.is;on feet
简述城市流浪乞讨人员救助有哪些原则?