A:肌细胞
B:神经细胞
C:卵细胞
D:口腔上皮细胞
如图为色盲患者的遗传系谱图,以下叙述正确的是( )
下列各组变化中,每个转化在一定条件下均能一步实现的是( )
It is universally ____(承认) that great changes have taken place since the new policy.