—Would she mind playing against her former teammates?

—________ She is willing to play against any tough players.[ ]

A. I think so.  

B. I'm not surprised.

C. Of course.  

D. Not likely!

男，70岁，有“慢性咳嗽、咳痰30年”病史，1周前感冒后出现食欲减退，轻微咳嗽，咳少量白粘痰，体温不高，并出现嗜睡，查血常规，WBC5.6×10⁹/L，N74%，HB168g/L，血气分析示pH7.32，PaCO₂86mmHg，PaO₂50mmHg。

在机械通气过程中，痰培养提示铜绿假单胞菌，此时应选用的抗生素为（）。

A.青霉素

B.头孢他啶

C.左氧氟沙星

D.红霉素

E.碳青霉烯类抗生素