我国的民族具有____、____、____的分布特点,这为各民族相互交往、团结合作、共同繁荣,提供了有利条件.
对于质点的运动,下列说法中正确的是( )
读图,完成下列问题。
As the smallest child of his family, Alex is always longing for the time _______ he should be able to be independent.