理解马克思主义政治经济学的枢纽是______。
A．剩余价值学说
B．生产价格理论
C．劳动二重性学说
D．劳动力商品理论
参考答案：C
On January 5, the U. S. Federal Reserve (the Fed) bought $10000000 of U. S. Treasury securities in the open market. At the time, the reserve requirement was 25 percent, and all banks had zero excess reserves. What is the potential impact of the Fed’ s purchase on the U. S. money supply（）
A. $ 25000000 decrease.
B. $ 40000000 increase.
C. $ 10000000 increase.
对于补充法律漏洞，强化法律的调控能力起着重要作用的是( )。
A．法律概念
B．法律原则
C．法律适用
D．法律规范
