主要供应胎儿心脏、脑和上肢的血液来自于____________。
参考答案：升主动脉
I like these shoes. Can I ______? [ ]
A. try them on
B. try on them
C. try it on
D. try on it
贯众的功效有（）
A.行气
B.化痰
C.止血
D.止呃
E.疗癣
