Please complete the summary of the whole text. It is said that in the US there are only three . They refer to , and season. Besides the three sports, Americans enjoy playing a variety of other sports. In summer, people do sports, such as surfing, sailing, diving, swimming, water skiing and fishing. In winter, they go skiing, go skating and play hockey. They also enjoy sports games. lots of them think it is worthwhile to spend much money on the of the games that their favorite teams or players play. Another way to watch sports games is to watch TV. In school, all students attend education classes, and they try to the school teams or join school sports leagues. In American, most sports were imported from abroad and only has a truly American origin. Americans not only import sports from other countries, but they also export sports . Many sports stars of America are world-famous.