《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
参考答案:A, C, E
半径为2cm的圆中,弦MN垂直平分弦AB,则MN=______cm.
33.— You seem to be familiar with this city!
— I ______ English in a school here for two years.It's great to be back again!
A.taught
B.have been teaching
C.had taught
D.have taught