【简答题】细胞周期检验点(cell cycle checkpoint)
【简答题】细胞周期中有哪些主要检验点?细胞周期检验点的生理作用是什么?
【单选题】I broke my relationship with John because he always found _____ with me.
【单选题】'What has happened?''The window ______ but I haven't found out who ______ it.'
D.
has been broken has broken