属于相反配伍关系的是（）
A.天花粉配乌头
B.石膏配知母
C.桑叶配菊花
D.陈皮配半夏
E.桂枝配麻黄
参考答案：A
A young man is practicing _ English with Mr King on the train.[ ]
A. to speak
B. saying
C. to say
D. speaking
You must（）in this area unless you have messages about the casualty.
A.keep radio silence
B.keep radio silent
C.keep radio be silent
D.keep silent the radio
