题干
It is ______for him to get to school on time, because it is raining ______.
A：hard; hardly
B：hardly; hard
C： hard; hard
答案(点此获取答案解析）
C
It is ______for him to get to school on time, because it is raining ______.
A：hard; hardly
B：hardly; hard
C： hard; hard
，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：（ ）