能被中性乙酸铅沉淀的是（）
A.甾体皂苷
B.三萜皂苷
C.酯皂苷
D.含羰基的甾体皂苷元
E.含羧基的三萜皂苷元
参考答案：B
—Pity you missed the lecture on nuclear pollution.
—I____ it, but I was busy preparing for a job interview.
A．attended
B．had attended
C．would attend
D．would have attended
《素问·水胀》描述石瘕的症状是（）
A.日以益大，状如怀子
B.其坚如石，按之痛剧
C.月事不以时下
D.按之则坚，推之则移
E.皆生于女子
.