試題詳解

29 Forensic science plays an important role in the investigation of serious crimes. One of the first significant achievements in the field was the development of techniques for identifying individuals by their ______. In the 19th century, it was discovered that almost any contact between a finger and a fixed surface left a latent mark that could be made visible by a variety of procedures.
(A)blood
(B)saliva
(C)semen
(D) fingerprints