关于杠杆，下列说法正确的是（ ）
A．杠杆是用来省力的
B．杠杆是用来省距离的
C．杠杆可省力或省距离
D．杠杆既省力又省距离
答案：C
The process of arbitrage does all of the following EXCEPT:()
A. promote pricing efficiency and produce riskless profits.
B. result in the correction of mispriced assets.
C. insure that risk-adjusted expected returns are equal.
激情是一种消极的情绪状态。（）
