题目

Children today stay indoors most of their time.They watch TV, play computer games and in some cases (情况), even do their homework.Figures show that today's youngsters (年轻人) stay outside for just over an hour each weekday, and fewer than five hours on Saturdays and Sundays.It also shows that 58 percent of parents wish their children to play outdoors more often, and they seriously worry their children don't spend enough time playing outdoors.In fact, playing outdoors is so important for children—not only to help them stay active and healthy，but also to communicate (交流) with frie (1)2.9升=(　　)毫升=(　　)立方厘米 (2)580立方厘米=(　　)立方分米=(　　)升