简答题：In the following article some paragraphs have been removed.

In the following article some paragraphs have been removed. For Questions 66～70, choose the most suitable paragraph from the list A～F to fit into each of the numbered gaps. There is one paragraph which does not fit in any of the gaps.
（一）
With unfamiliar human beings, when we acknowledge their humanness, we must avoid staring at them, and yet we must also avoid ignoring them. To make them into people rather than objects, we use a deliberate and polite inattention. We look at them long enough to, make it quite clear that we see them, and then we immediately look away.
66．______
The important thing in such an exchange is that we do not catch the eye of one whom we are recognizing as a person. We look at him without locking glances, and then we immediately look away. Recognition is not permitted.
67．______
If you pass someone in the street, you may eye the oncoming person until you are about eight feet apart, then you must look away as you pass. Before the eight-foot distance is reached, each will signal in which direction he will pass. This is done with a brief look in that direction. Each will veer slightly and the passing is done smoothly.
68．______
To strengthen this signal, you look directly at the other’s face before looking away.
69．______
It becomes impossible to discover just what they are doing. Are they looking at you too long, too intently Are they looking at you at all The person wearing the glasses feels protected and assumes that he can stare without being noticed in his staring. However, this is a self-deception. To the other person, dark glasses seem to indicate that the wearer is always staring at him.
We often use this look-away technique when we meet famous people. We want to assure them we are respecting their privacy and that we would not dream of staring at them. The same is true of the crippled or physically handicapped. We look brief and then look away before the stare can be said to be a stare.
70．______
Of course, the opposite is also true. If we wish to put a person down, we may do so by staring longer than is acceptably polite. Instead of dropping our gazes when we lock glances, we continue to stare. The person who disapproves of interracial marriages or dating will stare rudely at the interracial couple. If he dislikes long hair, short dresses, or beards, he may show it with a longer-than-acceptable stare.
A．There are different formulas for the exchange of glances depending on where the meeting takes place.
B．In the subway or bus where long rides in very close circumstances are a necessity, we may be hard put to find some way of not staring. We sneak glances, but look away before our eyes can lock. If we look with an unfocused glance that misses the eyes and settles on the head．the mouth, the body for any place but the eyes is an acceptable looking spot for the unfocused glance.
C．Actually in this way we are saying, in body language, “I know you are there, ”and a moment later we add, “But I would not dream of intruding on your privacy. ”
D．It is the technique we use for any unusual situation where too long a stare would be embarrassing. When we see an interracial couple, we also use this technique. We might use it when we see a man with an unusual beard, with extra longhair, with outlandish clothes, or a girl with a minimal miniskirt may attract this look-and-away．
E．For this passing encounter Dr. Erving Goffman in behavior in public places says that the quick look and the lowering of the eyes is body language for, “I trust you. I am not afraid of you. ”
F．Sometimes the rules are hard to follow, particularly if one of the two people wears dark glasses.