肝阳上亢所致的头痛宜用（）
A.脑力清丸
B.天麻钩藤颗粒
C.川芎茶调散
D.芎菊上清丸
E.正天丸
参考答案：B
—Let's go to Xihui Park tomorrow morning!
—Sorry, I can't go with you. My mother is ill and I must _____ her. [ ]
A. look at
B. look like
C. look after
D. look for
IEEE802系列规范、TCP协议、MPEG协议分别工作在（）。
A．数据链路层、网络层、表示层
B．数据链路层、传输层、表示层
C．网络层、网络层、应用层
D．数据链路层、传输层、应用层
t