A:donated
B:devoted
C:contribute t
D:treated
剪取开白花的碧桃枝条嫁接到开红花的碧桃上,新形成的植株将来开的花的颜色是( )
There are lots of to do every day
每种生物染色体数目是稳定的,其染色体的构成成分是( )