具消痰行水、降逆止呕功效的药物为
A．桔梗
B．川贝
C．竹沥
D．瓜蒌
E．旋覆花
参考答案：E
纸币的本质是一般等价物，具有价值尺度和流通手段职能。 [ ]
It was the third time that I _____ to Beijing. [ ]
A. have been
B. had been
C. was
D. been
