既善通经下乳，又可通络搜风、排脓消肿的药为
A．鸡血藤
B．穿山甲
C．通草
D．姜黄
参考答案：B
时距曲线
My mother ______ have dinner at home. [ ]
A. isn't
B. don't
C. doesn't
D. aren't
