Many people are needed to put on a play. Some of these people have made the setting, or set, that decorates the stage, and costumes（戏服）for the actors to wear. Actors have tried out for the parts. Then they have taken time to learn their lines. Even after the play is ready to be performed, the work doesn’t end. Let’s take a look behind the scenes.

　　To get ready for the play, actors put on costumes and makeup. These items will help the audience get to know the characters that the actors will play on the stage. Someone backstage may help with costume changes and repairs.

　　A set is like a costume for the stage. It can look like a forest or a playground or anyplace else you can imagine. Sets may be made from wood, paper, and even fabric. They are usually light so they are easy to move on and off the stage.

　　The lights in a play are very important. Lighting shows the time of day. It can also set the feeling of a scene. For example, brightness may make the audience feel happy and get their attention. A lighting technician controls the lighting during the play.

　　This is just some of what’s needed to put on a play. Next time you see a performance, imagine all of the people who work hard to help the performers put on a good show.

　　21. The first paragraph introduces readers to the topic by ________.

　　A. describing a scene in a play

　　B. showing how to produce a play

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