诗歌鉴赏最爱东山晴后雪(宋 杨万里)只知逐胜忽忘寒,小立春风夕照间。只爱东山晴后雪,软红光里涌银山。
— I'm feeling terrible! I have a bad cold.
— . You'd better see a doctor at once.
The left one is ____ (pretty) than the right one.
如图,函数y=f(x)在A,B两点间的平均变化率是( )