如图皮球落地后弹起过程中每隔相等时间曝光一次所拍摄的照片.由图可知,下落过程中,皮球的动能____ ,离开地面上升的过程中,皮球重力势能 ____ ,皮球运动过程中的机械能 ____ .(均选填”增大”、”减小”或”不变”.)
—Where are you going for your winter holiday?
—I’m going to visit Kunming. It is ______ too hot _______ too cold.
Line up from to , class! ( )