Mr. Smith gave the attendants a wonderful lecture ______ the company in the international conference.[      ]

A. in the place of      

B. owing to        

C. on behalf of    

D. standing for

听就是凭（）判断汽车的响声特征及规律，从而（）的原因。

A.听觉

B.嗅觉

C.断定故障

D.判定故障