― Hello, could I speak to Mr. Smith?

― Sorry, wrong number. There isn't _____ Mr. Smith here. [ ]

A. 不填

B. a

C. the

D. one

“夺血者无汗”的理论依据是：（）

A.精血同源

B.津血同源

C.肝肾同源

D.乙癸同源

E.以上都不是