一个运动物体在前2s内的平均速度是3m/s,后3s内的平均速度是5m/s,则它在5s内的平均速度是( )
A:等于4m/s
B:小于5m/s而大于3m/s
C:等于5m
D:大于5m/s
— Who will be the host of the party?
— As far as I know, Linda has already ____ (choose).