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    I like school days. I can learn many things from school. We have four classes in the morning and two in the afternoon. I like weekends, too. We don't go to school on Saturdays and Sundays. I often play ping-pong and play basketball on Saturday morning. I often play the violin (小提琴) on Saturday afternoon. I often do homework and play football on Sunday morning. I often go to the park on Sunday afternoon.

（2016•海南）读南海诸岛略图（如图），借助信息技术，三沙市的居民也可以聊微信、上淘宝下单，这主要得益于（  ）

①当地迅速发展的工业         ②当地繁荣的旅游业

③国家高新技术产业迅猛发展    ④国家的大力支持．