A:2
B:-12
C:-2
D:12
如图,在运动员接球过程中体现了力既可以使物体的____发生改变,又可以使物体的____发生改变;网球对球拍的压力是由于____(“网”、“球”)发生弹性形变而产生的。
In the UK, this is the ground floor. In the US, this is the first floor.