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What’s the most popular school activity among American students? The   is the school dance. Most American high schools have at least two dances  
 the year, one in winter and the other in spring. Students attend these events 
 it’s a great opportunity for them to meet  
 friends.
At the dance, there will be snacks and photo booths (机器拍照亭), as well as strict(严格的) rules to    create a healthy and enjoyable evening for all students. And all the dancers will be given a security check(安检)before they come into the dance  
 . This is acceptable. But some rules may be a little bit over the top(过分). For example, a school once asked  
  students to keep a standing position while they were dancing. That  
 the students couldn’t do anything freely. You’d  
 not break the rules because you’ll be asked to leave there, or even worse, be placed on a do not invite list.