题干
―______________
―Because they are very smart.
―Because they are very smart.
A：How do you like pandas?
B：What animals do you like?
C：What’s your favorite animal?
D：Why do you like koalas?
答案(点此获取答案解析）
A
，点迹间各段长度已标在图上．若要求得该过程中小车运动的平均加速度，下列计算公式中最合理的是：（ ）