2012淘金英语专业四级听写 上海外国语大学 请从正文部分开始听写
A flash mob is where young people suddenly gather in a large group for no apparent reason. Flash mobs can involve hundreds of people who do not all know each other. But they all meet at the same time, then leave the area quickly. A flash mob can be held for any reason, but usually just to have some fun. The people involved in a flash mob do not know the time or place of the meeting until just minutes before it takes place. They get the details from a web site, or by e-mail or as a text message on their wireless phone. What do people do at flash mobs? Flash mobbers in a store will all ask for the same product. On a street, they may sing a song at the same time, shout meaningless words, hug each other or make some kind of noise. Then, just as quickly as they came, they leave. It all happens in a flash.