【正确答案】正确答案： Flash Mobs 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. / 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. /