—Do you regret bringing up your opinion at the meeting?

—No.________,  I think it is very necessary. [ ]

A. On the contrary  

B. First of all

C. On the other hand  

D. In a word

支气管哮喘患者突然出现胸痛、气急、呼吸困难、大汗、不安，应考虑（）.

A.自发性气胸

B.支气管哮喘急性发作

C.左心衰竭

D.肺炎

E.胸膜炎