题目

如图4所示为一质点做直线运动的速度－时间图象，下列说法正确的是(  ) A．整个过程中，CE段的加速度最大 B．整个过程中，BC段的加速度最大 C．整个过程中，D点所表示的状态离出发点最远 D．BC段所通过的路程是34 m 答案：ACDI used to dance．Now I enjoy dancing．You had to get a good camera and buy films（胶卷）．Did you used to collect stamps?You’ve changed a lot．It helps me to be more careful and it gives me a lot of fun．You used to listen to music, didn’t you?A：__1___B：Yes, I did, but now I am interested in listening to music and playing the violin．When I am free, I enjoy playing it．A：___2__B：That’s right．What do you like doing now, Jack?A：___3___B：That’s a good hobby．What do you think of it?A：___4___B：What did you use to do?A：I used to take photos．B：I think taking photos is expensive．____5___ Am I right?A：You are right．So I don’t do it now．