题目：
| Cloze test. | ||||
| 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. As a society, we really need to 11 this problem and do something about it. Parents and coaches 12 should act as better examples for children. They also need to teach children better 13 . They should not just cheer when children win or act aggressively. They should teach children to 14 , themselves whether they win or not. Besides, children should not be allowed to continue to play when they are injured. If adults allow children to play when injured, this gives the message that 15 is not as important as winning. | ||||
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答案：
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答案：D题目分析：立体构型为平面三角形的分子应含有3个δ键，且没有孤对电子，中心原子为sp2杂化，据此将进行解答。A、Si原子形成4个δ键，根据价层电子对互斥理论可知孤对电子数＝＝0，所以为sp3杂化，立体构型...
