在临床麻醉中触诊脉搏首选的动脉（）。

A.颈总动脉

B.耳前动脉

C.桡动脉

D.股动脉

E.足背动脉

After the break, the lecturer went on to talk ______ about the new academic concept. [ ]

A. at length      

B. in all        

C. in turn    

D. at most