Paragraph 3:_____.

　　该段主要描述锻炼和友情，中心句为该段的第一句和最后一句，“For kids and young adults, team sports offer a way for them to get out and meet with friends.”，“ It can also give players a greater respect for one another and can build friendships that last a lifetime.”， 对于孩子和年轻人来说，团队运动为他们走出去和朋友聚会提供了一种方式。它还可以给运动员更大的尊重，也可以建立一个终生的友谊。故选D。