He won in the story competition and his parents were very .
A:smart
B:proud
C:sorry
D:upset
两个人以相同的速率同时从圆形轨道的A点出发,分别沿ABC和ADC行走,如图所示,当他们相遇时不相同的物理量是( )
与右心室相连通的血管是( )