真寒假热、真热假寒证的病机是：（）
A.阴阳偏胜
B.阴阳偏衰
C.阴阳互损
D.阴阳格拒
E.阴阳转化
参考答案：D
截至2010年5月11日，广东省21个地级市及省公安厅的官方微博已全部开通并完成认证，被网友称为“微博110”。政府微博的开通[ ]
A．拓宽了公民政治参与的渠道
B．改变了政府与公民的关系
C．扩大了公民的政治权利
D．方便了公民直接管理国家事务
Which of the following statements about portfolio risk and diversification is least accurate（）
A. Unsystematic risk can be substantially reduced by diversification.
B. Systematic risk can be eliminated by holding securities in a well-diversified international stock portfolio.
C. Diversification results from combining securities that have less than perfect positive correlation between their returns to reduce portfolio risk.
