________she walked, she dropped the seeds along the road so that she would know the way back.
A:As
B:While
C:When
D:After
终生具有造血功能的红骨髓存在于长骨的( )
去年我国西南地区遭遇百年不遇的大旱,结合下图,完成下列各题。
看图写字。
____