一个人站在阳台上在同一位置,以相同的速率分别把三个球竖直向上抛出,竖直向下抛出,水平抛出,不计空气阻力.则三球落地时的速度大小( )
A:上抛球最大
B:下抛球最大
C:平抛球最大
D:三球一样大
在我国,保证人民当家作主,依法直接行使民主权利,管理基层公共事务和公益事业的最有效途径是( )
Christmas is my favourite 1. On Christmas, my family 2 my aunt,uncle and cousin to our house. We 3 gifts to each other. I give my cousin a 4 gift. We sing the Christmas 5 together. I think we are very happy.