以节流为基础的循环为（）。
A、林德循环
B、克劳特循环
C、卡皮查循环
参考答案：A
经济法主体中的调控主体与规制主体是主导者，受控主体和受制主体处于完全被动地受控或受制地位。( )
Some students think English is very difficult _____ it's very interesting, [ ]
A. then
B. or
C. and
D. but
