将籽粒饱满的种子分为甲、乙两组,在25℃~30℃下播种,甲组种在潮湿贫瘠的土壤里,乙组种在潮湿肥沃的土壤里,这两组种子的发芽情况是( )
A:甲发芽率高
B:乙发芽率高
C:甲不发芽
D:甲乙发芽率相同
Lucy is a(n) ______ girl and she doesn't like talking much.
产品生产环节中,附加值最低的环节是( )