(2)否定前缀un－：

① conscious adj.意识到的；自觉的→unconscious adj.无意的；不知不觉的

②clear adj.清楚的→unclear adj.不清楚的

③comfortable adj.舒服的→uncomfortable adj.不舒服的

④fair adj.公平的→unfair adj.不公平的

原文呈现

If you say the word"communication①"，most people think of② words and sentences.Although these are very important，we communicate with more than③ just spoken and written words.Indeed，body positions are part of what we call"body language".We see examples of unconscious④ body language very often，yet there is also"learned"body language，which varies⑤ from culture to culture.

We use"learned"body language when we are introduced to strangers.Like other animals，we are on guard⑥ until we know it is safe to relax.So every culture has developed a formal⑦ way to greet strangers，to show them we are not aggressive⑧.Traditionally⑨，Europeans and Americans shake hands⑩.They do this with the right hand-the strongest hand for most people.If our right hand is busy greeting someone，it cannot be holding a weapon⑪.So the gesture⑫ is saying，"I trust you.Look，I'm not carrying a threatening⑬ weapon."If you shake hands with someone，you show you trust them.We shake hands when we make a deal⑭.It means，"We agree and we trust each other."

Greetings in Asian countries do not involve⑮ touching the other person，but they always involve the hands.Traditionally in China，when we greet someone，we put the right hand over the left and bow⑯ slightly⑰.Muslims⑱ give a"salaam⑲"，where they touch their heart，mouth and forehead⑳.Hindus\s\up7(21(21) join their hands\s\up7(22(22) and bow their heads in respect\s\up7(23(23).In all of these examples，the hands are busy with the greeting and cannot hold a weapon.

Even today，when some people have very informal styles of greeting，they still use