We walk in and usually turn around to face the door.If someone else comes in, we may have to move.And here，according to Gray, lift users unthinkingly go through a set pattern of movements. He told the BBC what he had observed.

　　He explained that when you are the only one inside a lift, you can do whatever you want—it’s your own little box.

　　If there are two of you, you go into different corners，standing diagonally (对角线地) across from each other to create distance.

　　When a third person enters，you will unconsciously form a triangle.And when there is a fourth person it becomes a square，with someone in every corner.A fifth person is probably going to have to stand in the middle.

　　New entrants (新进入者) to the lift will need to size_up the situation when the doors slide open and then act decisively.Once in，for most people the rule is simple—look down，or look at your phone.

　　Why are we so awkward in lifts?

　　“You don’t have enough space，”Professor Babette Renneberg，a clinical psychologist at the Free University of Berlin，told the BBC.“Usually when we meet other people we have about an arm’s length of distance between us.And that’s not possible in most elevators.”

　　In such a small，enclosed space it becomes very important to act in a way that cannot be construed (理解) as threatening or odd.“The easiest way to do this is to avoid eye contact，”she said.语篇解读　本文是一篇说明文。文章讲述了电梯里一些容易被忽视的礼节：每当有人进入电梯时，电梯里人的位置随之变化，以此来保持距离和空间。1．The main purpose of the article is to ________.

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