A:呈圆形变化
B:呈直线变化
C:呈曲线变化
D:呈螺旋形变化
鸟卵结构中,将来可发育成雏鸟的是( )
— Attention, please. The plane has to be _________ because of the foggy weather.— Oh, bad luck! We have to wait now.
“人间四月芳菲尽,山寺桃花始盛开”表明影响桃花开放的环境因素是( )