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完形填空。阅读下面短文，掌握其大意，然后从各题所给的四个选项A、B、C和D中，选出最佳答案。 People think children should play sports. Sports are fun, and playing with others. However, playing sports can have __1 effects on children. It may produce feelings of poor self-respect or aggressive behavior in some children. According to research on kids and sports, 40,000,000 kids play sports in the US. Of these, 18,000,000 say they have been __2 at or called names while playing sports. This leaves many children with a bad __3 of sports. They think sports are just too aggressive. Many researchers believe adults, especially parents and coaches, are the main _4 of too much aggression ill children's sports. They believe children _5 _ aggressive adult behavior. This behavior is then further strengthened through both positive and negative feedback. Parents and coaches are powerful teachers because children usually look up to them. Often these adults behave aggressively themselves, sending children the message that__6 is everything. Many parents go to children's sporting events and shout _7 _ at other players or cheer when their child behaves _8__. As well, children arc even taught that hurting other players is _ 9 or are pushed to continue playing even when they are injured _10 , the media makes violence seem exciting. Children watch adult sports games and see violent behavior replayed over and over on television. | 
