题目

任务型阅读；阅读下列短文，回答问题。 American singer Beyonce surprised her fans. She released (发行) her new album without advertising it or telling anyone. It is one of the biggest secrets in music history. She wanted to tell her fans about the album by herself. She did not want her record company to tell them. It was also a surprise for other singers. She didn’t want to get anything between her music and her fans. She said she didn’t want anybody to talk about her new record before she did. Beyonce’s new album is only on iTunes. People can only download (下一个做直线运动的物体，在t=5s内速度从V1=12m/s增大到V2=28m/s，通过的位移s=80m，则该物体在这5s内的平均速度大小为（　　）A．12m/sB．16m/sC．20m/sD．无法确定