A:植物种类
B:细胞中染色体数目
C:植物材料的年龄
D:环境条件
按由老到新的年代顺序,下列排序正确的是()
下列有关物质的用途,与性质不对应的是( )
A: Look! What beautiful pictures of flowers they are! ____
B: No, they are not mine.
A: ____
B: They are my father's.
A: Good job! Your father is a great man.