用3，5，7组成不同的三位数共有______个．

完型填空。

     Are you good at understanding body language? You are probably   1    than you think,
according to the experts.
    What is body language exactly?   2    , it is signals made by body movement, gesture and
eye movement.
    Body language can actually   3   a lot of information, and it can help us   4   a person's attitude
and state of mind. In fact, studies have suggested that only 7% of communication involves actual
   5   ,while 55% is body language and 38% is intonation(语调).
     Many examples of body language are    6  to identify. In most cultures, smiling shows happiness
and a /an   7    attitude. So, when someone smiles at you, they're telling you that they are open,
interested and happy to   8   . But if someone puts their arms across their chest, they don't want
to communicate with you. And if this is combined with a serious facial expression, you should 
  9   because this can mean anger.
     It's very difficult to   10   with your body language. For example, when people pretend to   11  ,
they only use the muscles around the mouth-and the top half of their face remains   12  .
     However, a true smile involves the   13   face, including the cheeks and eyes. Research shows that
most people can see whether a smile is true by looking at the top half of the   14  .
     One of the great advantages with body language is that you don't have to   15   it -you already
know it, even if you don't know you do.