《素问·生气通天论》提出"精神乃治"的关键是（）
A.真气从之
B.阴平阳秘
C.阳密乃固
D.独立神守
E.内养精神
参考答案：B
标志着西周“学在官府”瓦解的是( )
A．官师分离
B．政教分离
C．私学兴起
D．官学消失
The manager of a pension fund determines that during the past five years 85 percent of the stocks in the portfolio have paid a dividend and 40 percent of the stocks have announced a stock split. If 95 percent of the stocks have paid a dividend or announced a stock split, the joint probability of a stock paying a dividend and announcing a stock split is closest to:（）
A. 30%.
B. 45%.
C. 55%.
