如图,⊙O为△ABC的外接圆,∠BAC=55°,则∠OBC 的度数为( )
A:25°
B:35°
C:55°
D:70°
Hainan Island is ____ than Beijing. (hot)
-- It is reported that many wild animals in the world are _______ because of human behavior.
-- We must do something to stop people from hunting and selling these animals.
在青蛙的繁殖季节,雌蛙与雄蛙抱对的生物学意义是( )