A:12
B:33
C:23
D:22
以口腔上皮细胞为实验材料观察DNA和RNA在细胞中的分布,以下对此实验的描述及相关说法正确的是( )
《识字6》中____、____、____、____是气象现象的。
They can't buy anything because _________ of the shops are open now