Our charity show for three hours this afternoon. We were tired but very happy.
A:lasts
B:lasted
C:has lasted
D:will last
从点滴做起,勤俭节约。请你说一说我们可以做些什么。
如图所示为根尖结构模式图.请根据要求回答下列相关问题:
以下关于细胞生命历程的说法错误的是( )