肝肾亏虚，阴精不足，筋脉失养，形成痿证者，选方为E．
If the expected returns of two risky assets have a perfect negative correlation, then risk
A. is increased
B. is unaffected
C. falls to zero
D. is reduced by one-half
In the futures market, leverage______.
A. refers to investors' having control over large cash amounts of commodities with comparatively small levels of capital
B. means a small change in a futures price can translate into a huge gain or loss
C. likes a double-edged sword
D. both A and B
E. A.B and C
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