单项选择题

Faces, like fingerprints, are unique. Have you ever wondered how it is possible for us to find out people Even a skilled novelist probably could not make a description of all the features(特征) that make one face different from another. Yet a very young kid or even an animal, such as a pigeon,can learn to recognize faces. We all take the ability for granted.
We can also tell people apart by which ways they behave. When talking of someone’s personality, we mean the methods in which he or she acts, speaks, thinks or feels that make him or her different from others.
Like the human face, human personality is so complicated. But describing someone’s personality in words is somewhat much easier than describing his face. If you were asked to describe what a "nice face" looked like, you probably would have a lot of difficulties. But if you were asked to describe a "nice person" you might begin to think about someone who was kind, considerate, friendly, generous,and so forth.
There are many words to describe what a person’s thought is and how a person feels and acts. Gordon, an American psychologist found nearly 18, 000 English words characterizing differences in people’s behavior. And many of us use such terms as bookworms, conservatives to describe one’s personality.
People have always tried to "type" each other. Actors, on early Greek theater stage wore masks to show the audience whether they played the villain’s(坏人) or the hero’s role. In reality, the words "person" and "personality" come from the Latin "persona", meaning "mask". Nowadays, most television and movie actors do not wear masks. But we can easily tell the "good guys" from the "bad guys" for the reason that the two types differ in appearances as well as in actions.

The main idea of this passage is ().

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