修改病句 Listen!She is sing ahd under the trees .

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• 修改病句 Listen!She is sing ahd under the trees .
• It is Sunday.Hundreds of people are in the park.They are men and women ,boys and girls .Some old people walk along the lake.Some girls play games under big trees .Some boys play football over there.Some little babies play in the grass .A group of women sing and dance.They have a good time after a week of work and study .Look!They are two Americans .They speak English .Two children listen to them. People in the park are friends.Can you see the girl?She
• 修改病句 Listen!She is sing ahd under the trees .
• 已知函数y=f（x）=x3+px2+qx的图象与x轴切于非原点的一点，且y最小=-4，那么p=_，q=_．
• 规则的意义和作用?