关于自由落体运动,下列说法正确的是( )
A:自由落体运动是一种匀速直线运动
B:物体刚下落时,速度和加速度都为零
C:物体在下落的过程中,每秒速度都增加9.8m/s
D:物体的质量越大,下落时加速度就越大
读一读,写一写
①— Are there any ____ ?
— Yes, there are.
②There are many tall ____ in my city.
③There is a ____ above the river.
④- Are there any houses in the ____?
-Yes, there are.