Speaker A: It’s been lovely seeing you again, Bill. You and Mandy have to come over and see the baby sometime.
Speaker B: ().

A. Congratulations. How old is your baby

B. It’s lovely to see you again, George.

C. Yeah, Mandy would love that.

D. All right. Let me see you off downstairs.

盐酸氯丙嗪中有关物质的检查采用（）.

A．薄层色谱法 

B．高效液相色谱法 

C．气相色谱法 

D．比色法 

E．紫外分光光度法