脾胃虚寒忌用，反藜芦的药物是
A．夏枯草
B．苦参
C．菊花
D．龙胆草
E．知母
参考答案：B
-What a nice computer!
-My parents bought it for my sister and me. It's
A．ours
B．hers
C．theirs
D．mine
______是数据库系统的核心。
