单项选择题
A．It is difficult to tell someone's personality. B．It is difficult to describe someone's face. C．It is difficult to recognize fingerprints. D．It is difficult to know what someone else thinks about.
A．you have to refer to a dictionary B．you have to search your mind hard for proper words C．you have to say more than necessary D．you have to compare it with a "nice person"
A．wants to tell us people are working hard B．pictures people' s fingerprints C．takes for example some terms for people' s behavior D．makes fun of others