Faces, like fingerprints are unique. Did you【36】wonder how it is possible for us to【37】people? Even a skilled writer probably could not describe all the【38】that make one face different from another. Yet a very young child —【39】an animal, such as a cat — can learn to recognize faces. We all【40】this ability for granted. We also tell people【41】by observing how they behave. When we talk about someone's personality, we mean the【42】in which he or she acts, speaks, thinks or feels that【43】that individual different from others. Like the human face, human personality is very complex. But describing someone's personality【44】words is somewhat easier than【45】his face. (36)