题目

I’m sure you know the song “Happy Birthday”. But do you know who wrote the song and for whom it was written?    The retired professor, Archibald A. Hill in Lucasville, USA could tell us the story. Ninety-seven years ago, two of Mr. Archibald Hill’s aunts, Miss Patty Hill and Miss Mildred Hill were asked to write some songs for a book called “Song Storied for the Sunday Morning”. Miss Patty Hill and Miss Mildred Hill were both kindergarten teachers then. They loved children very much and wrote many beautiful songs for the book. One of them was the famous “Good Morning to You.”有一物体从斜面的顶端下滑，第1s通过了2m，第2s通过了4m，第3s通过了6m，则该物体做（　　）A．匀速直线运动B．变速直线运动C．变速曲线运动D．匀速曲线运动