Over a very large number of trials, the probability of an event ________ is equal to the probability that it will not occur.

A．occurring

B．to occur

C．occurs

D．occur

张某感冒5日，症见发热微恶风，头胀痛，干咳痰少，口、咽、唇、鼻干燥，苔薄舌红少津，脉略数。

本病例的治法为（）

A.辛凉解表，清肺润燥

B.清暑祛湿解表

C.双解表里，清热解毒

D.辛温解表，化痰止咳

E.养阴止咳润肺