嗳气的主要病机是
A．麻子仁丸B．更衣丸C．三物备急丸D．润肠丸E．五仁丸
参考答案：C
— What did your father do last holiday?
— He _____________ football last holiday. [ ]
A. play
B. plays
C. played
已知等腰三角形的底边长为15cm，一腰上的中线把其周长分成两部分的差为8cm，则腰长为______cm．
