患者，男，28岁。素体阳盛，近日目赤红肿，口舌生疮，咽喉肿痛。治疗应首选的药物是（）。
A.大黄
B.芒硝
C.番泻叶
D.芦荟
E.甘遂
参考答案：B
Given a normally distributed population with a mean income of $40000 and standard deviation of $ 7500, what percentage of the population makes between $ 30000 and $ 35000（）
A. 15.96.
B. 13.34.
C. 41.67.
