成人伤寒患者，抗菌治疗首选下列何种药物（）
A.氯霉素
B.第三代头孢菌素类
C.磺胺类
D.喹诺酮类
E.氨苄西林
参考答案：D
等电点沉淀
Man: Look, the view is fantastic．Could you take a picture of me with the lake in the background Woman: I'm afraid I just ran out of film. Question: What do we learn from the conversation
A．The woman is watching an exciting film with the man.
B．The woman can't take a photo of the man.
C．The woman is running toward the lake.
D．The woman is filming the lake.
