A:How is your grandma
B:Where did you go for holiday
C:What did you do in your holiday
D:How was your break
下列人体所需的营养物质与缺乏症对应错误的是( )
某种生物的体细胞中有16条染色体,它的一个体细胞连续分裂两次,得到4个子细胞,每个子细胞中的染色体数目是( )