大地点用IN,小地点用AT,但是应试教育讲究精确,没有办法,只得求精求准.

<P>at the airport在飞机场</P>
<P>at指的可以是“在……内部”“在外部”“在旁边”</P>
<P>in仅指“在……内部”</P>
<P>If he is “at the airport”，he may be{in the street outside/in the airport building/in a waiting-room/at a booking office}</P>