小青龙汤中主要起发汗散寒解表作用的药物是（）
A.麻黄、桂枝
B.干姜、半夏
C.细辛、麻黄
D.桂枝、细辛
E.细辛、干姜
参考答案：A
A portfolio manager is looking at an investment that has an expected annual return of 10% with a standard deviation of annual returns of 5%. Assuming the returns are approximately normally distributed, the probability that the return will exceed 20% in any given year is closest to:（）
A. 0.0%.
B. 4.56%.
C. 2.28%.
车辆驾驶员严禁酒后（）或在行车过程中饮酒。
A、聊天；
B、休息；
C、行车；
D、行走
