功能凉血退蒸，清肺降火的药物是（）
A.青蒿
B.地骨皮
C.石膏
D.银柴胡
E.胡黄连
参考答案：B
In the school hall, where a meeting , some students are busy preparing for it.
A．is held
B．has been held
C．is being held
D．is to be held
VRRP报文的ip协议号是（）
A.112
B.114
C.116
D.118
