概念学习的心理机制主要有两种，一是______，二是______。
参考答案：概念形成 概念同化
—I’m sorry to keep you waiting for so long．I’ll make short work of my lunch．
—____．I’m not in a hurry．
A．Take it easy
B．Take your time
C．Not at all
D．Don’t be nervous
减租减息政策
