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