A:The parents as well as their child
B:Not the parents but their child
C:Neither the child nor his parent
D:Both the parents and their child
0.5m/s2
电影《高考1977》反映了恢复高考后的第一次考试,如果让你去设计考试场景,可以出现的是
下面是有关燕麦实验的示意图,图中所示燕麦胚芽鞘的某些部位纵向插入了云母片。请分析图中a至f的琼脂块中,生长素含量正确的一组是( )
产生卵细胞、形成受精卵以及胚胎发育的场所分别是( )