—Today I'll go to the zoo with my parents.
—____________
A:Yes, pleasure.
B:Have a nice day.
C:What a good day.
D:Good idea.
汽车所行的速度和时间成反比例。
一物体竖直向下匀加速运动一段距离,对于这一运动过程,下列说法正确的是( )