A:原因
B:目的
C:过程
D:影响
如图,在平面直角坐标系内,O为原点,点A的坐标为(﹣3,0),经过A、O两点作半径为52的⊙C,交y轴的负半轴于点B.
如图为反映某生理过程或现象的曲线,不正确的是( )
--- I hope Ted will be the winner.
--- But it ______ be him, because he has made so many mistakes.
绿色开花植物的卵细胞与精子结合发生在( )