阅读理解What are the children doing?
    What are you doing, children? Oh, we are playing games. Look at Li Lei. He is throwing the frisby with Jim. What about the twins? They are flying kites. The kites are very nice. One like a bird, the other is like a plane. Li Tao is playing basketball with me. Han Mei and Ma Lin are singing an English song under a big tree.

小明沿水平方向用力推地面上的桌子,但没有推动.下列说法中正确的是     （    ）

执行如图所示的程序框图，则输出s的值为（   ）