A:very, very
B:much, very
C:well, fast
D:well, very
绿色开花植物在开花之后,必须要完成哪两个主要过程后才能形成果实和种子( )
When our teacher came into the classroom, we stopped ____ (talk).
果园里有苹果树420棵,梨树350棵,梨树和苹果树棵数的比是____∶____.