板蓝根的功效是（）
A、利咽，凉血
B、利咽、祛痰
C、利咽，通便
D、利咽、止血
E、利咽，疏肝
参考答案：A
Would you please_____ in the library? [ ]
A. not to talk loudly
B. don't talk loudly
C. not talk loudly
D. not talking loudly
关于慢性呼吸衰竭不正确的是
A．纠正酸碱平衡失调
B．保持呼吸道通畅
C．防治多器官功能损害
D．缺氧伴明显CO2潴留时应给予高浓度持续吸氧
E．控制感染
