A:①③
B:③④
C:②③
D:②④
执行如图所示的程序框图,输出的S值为﹣4时,则输入的S0的值为( )
A new study says that American children have exciting after-school life. Many junior and senior students have a lot of interesting things to do in their free time. About 57% students have activities every day. 82% students have activities at least four times a week. American students spend their free time doing sports or enjoying arts, music and dancing. They like to have fun outside school because they can make a lot of friends during their activities.