The scientists wrote in the online journal Public Library of Science Genetics，“Such predictive modelling could be forensically useful. For example, DNA left at crime scenes could be tested and faces could be predicted in order to help to narrow the pool of potential suspects. Further, our methods could be used to predict the facial features of descendants, deceased ancestors, and even extinct human species. In addition, these methods could prove to be useful diagnostic tools.” The team developed a model which first established a range of physical face shapes from people of mixed West African and European ancestry from the US, Brazil and Cape Verde. Measurements were taken of thousands of point coordinates on grids placed over 3­D images of the faces.

　　Statistical methods were then used to determine the relationship between facial differences and the effects of genders, ethnic ancestry and individual gene variants.

　　1．The underlined word “mugshots” in the second paragraph most probably means “________”．

　　A．different faces

　　B．characteristics

　　C．pictures of faces

　　D．genders

　　2．What can be inferred from the passage?

　　A．DNA has been used to build up a picture of an offender's face.

　　B．It may be much easier to catch criminals with the help of DNA.

　　C．In all, 20 genes had“significant effects”on facial appearance.

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