A:①②
B:①③
C:②④
D:③④
When he returned from his vacation,he found his apartment____and a lot of things____.
下列各句中划线成语的使用,恰当的一句是 ( )
一个生态系统,无论大小,都是由( )
你能用上下说一说龟兔赛跑的故事吗?