Parents should let their children make their own ____ (decide).
已知:如图所示,AB∥CD,BC∥DE.求证:∠B+∠D=180°
证明:∵AB∥CD
∴∠B=∠____ (____ )
∵BC∥DE,∴∠C+∠D=180°(____ )
∴∠B+∠D=180°(____ )
选词填空( )。
漫步在镜廊内,碧港的天空、_______(安静、幽静、静谧、宁静)的园景映照在镜墙上,满目苍翠,仿佛置身在芳草如茵、佳木葱宠的园林中。
喜马拉雅山脉是由( )
---___________. I learned it all by myself.