A:主动脉
B:肺动脉
C:肺静脉
D:上下腔静脉
写出生字并且组词
wèi:____、____
yùn:____、____
háng:____、____
中国近代史以鸦片战争为开端主要是因为
— Two men got hurt. Finally, the police sent them to the hospital.