从根本上改变了唐五代以来词坛上小令一统天下的格局是谁？他主要做了什么事？
参考答案：
柳永，他主要是大量创作慢词
In The Principles of Language Study (1921), Palmer put forward nine fundamental principles of good language teaching and learning, of which ______ was the first and most important.
A．reinforcement and response
B．habit-formation
C．form and meaning
D．meaning and situation
设备利用套在轴上的油环、油链、油轮等进行摩擦副润滑的方法称为（）润滑。
A.浸油
B.带油
C.溅油
D.滴油
