物体通过接触传递热的方式是（）

A.热传导

B.热对流

C.热辐射

D.热平衡

E.热放散

Although I tried my best to convince them _____the importance and urgency of the operation, the

doctors were not convinced _______ it immediately.     [ ]

A. with; to perform  

B. of; doing    

C. on; to do    

D. of; to perform