問題詳情

III. ReadingChoose the best answer 10%Since the late nineteenth century, fingerprint identification methods have beenused by police agencies around the world to identify suspected criminals as well asthe victims of crime. The basis of the traditional fingerprinting technique is simple.The skin on the palmar surface of the hands and feet forms ridges, so-called papillaryridges, in patterns that are unique to each individual and which do not change overtime. Even identical twins (who share their DNA) do not have identical fingerprints.  The best way to render latent fingerprints visible, so that they can be photographed,can be complex and may depend, for example, on the type of surfaces on which theyhave been left. It is generally necessary to use a ‘developer’, usually a powder orchemical reagent, to produce a high degree of visual contrast between the ridgepatterns and the surface on which a fingerprint has been deposited.Developing agents depend on the presence of organic materials or inorganicsalts for their effectiveness, although the water deposited may also take a key role.Fingerprints are typically formed from the aqueous-based secretions of the eccrineglands of the fingers and palms with additional material from sebaceous glandsprimarily from the forehead. This latter contamination results from the commonhuman behaviors of touching the face and hair. The resulting latent fingerprintsconsist usually of a substantial proportion of water with small traces of amino acidsand chlorides mixed with a fatty, sebaceous component that contains a number offatty acids and triglycerides. Detection of a small proportion of reactive organicsubstances such as urea and amino acids is far from easy.Fingerprints at a crime scene may be detected by simple powders, or bychemicals applied in situ. More complex techniques, usually involving chemicals, canbe applied in specialist laboratories to appropriate articles removed from a crimescene. With advances in these more sophisticated techniques, some of the moreadvanced crime scene investigation services from around the world were, as of 2010,reporting that 50% or more of the fingerprints recovered from a crime scene hadbeen identified as a result of laboratory-based techniques.Text source:Fingerprint. (2010, December 19). InWikipedia, The Free Encyclopedia. Retrieved19:14, December 21, 2010
31. Which of the following is the best title for this passage?
(A) In Situ Powder Use in Crime Scene Investigations
(B) How to Identify a Criminal
(C) Amino Acids in Fingerprint Detection
(D) Fingerprint Composition and Detection
(E) Uses of Papillary Ridge Secretions

參考答案

答案：D
難度：適中0.680851
統計：A(0),B(4),C(5),D(32),E(3)

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