题干
—People are never ____ with what they have. They always want something more or something different.
—No, that’s not my case. What I have has ____ me.
A：satisfied; exciting
B：satisfied; excited
C：satisfying; exciting
D：satisfying; excited
答案(点此获取答案解析）
B
，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：（ ）
