A:冰雪高原
B:白色沙漠
C:风库
D:潮湿闷热
— I'm hungry. ________ there any bread in the fridge, Mum?
— None, but we have cakes. Would you like to have one?
下列各式:①4x2﹣y2;②2x4+8x3y+8x2y2;③a2+2ab﹣b2;④x2+xy﹣6y2;⑤x2+2x+3其中不能分解因式的有( )