A:has come; have come
B:have come; has come
C:has come; has come
D:have come; have come
ride a bike
fly kites
sleep under a tree
read books
skip
sing a song
play football
Today is Sunday. The weather is fine. The children are playing in the park. Look. Sam and Leo are flying kites.
有些药品上标有“OTC”字样,表示这种药属于( )
关于黄土高原的形成,已得到广泛支持的说法是( )
如图所示,A、B两物体质量分别为mA、mB,且mA>mB,置于光滑水平面上,相距较远.将两个大小均为F的力,同时分别作用在A、B上经过相同距离后,撤去两个力,两物体发生碰撞并粘在一起后将()